Renesas EK-RE01 256KB Installation and operating instructions

Application Note

R01AN5406EJ0100 Rev.1.00 Page 1 of 16

Aug. 25, 2020

Energy Harvesting Launch Operation Demo using Quick

Start Mode Enabling Effective MCU Utilization during

Charging Time for RE01 256KB Group

Summary

This application note provides sample code to demonstrate energy harvesting and RE01 Family's unique

quick-start mode using the EK-RE01 256KB (Evaluation Kit RE01 256KB), a development kit for the RE01

256KB Group.

In this sample code, power is supplied from an energy harvesting control circuit (EHC) powered by an energy

harvesting element (solar panel/thermoelectric generator). By using the power generated by EHC, the MCU

is able to maintain continuous MIP LCD (SMIP) operation.

The device also has a quick start function that is unique to the EHC circuit. This function enables the

operation before the secondary battery is fully charged. In this demo, SMIP display is started during the quick

start period.

Please refer to the project included in the package for the sample code.

Target Device

RE01 256KB Group

Note

When applying the sample code covered in this application note to another microcomputer, modify the code

according to the specifications for the target microcomputer and conduct an extensive evaluation of the

modified program.

Related Document

RE01 1500KB, 256KB Group Getting Started Guide to Development Using CMSIS Package (R01AN4660).

Energy Harvesting Launch Operation Demo using Quick Start Mode Enabling Effective

MCU Utilization during Charging Time for RE01 256KB Group

R01AN5406EJ0100 Rev.1.00 Page 2 of 16

Aug. 25, 2020

Contents

1. What is Quick Start for Energy Harvesting Circuit for RE Family?............................................3

2. Specifications ..........................................................................................................................3

2.1 Description of Project .............................................................................................................................. 3

2.2 Overview.................................................................................................................................................. 3

2.3 Pins Used ................................................................................................................................................ 5

2.4 Procedure for Operating Sample Code ................................................................................................... 6

2.5 Jumper settings and power generator element connections .................................................................. 7

3. Conditions for Checking Operation ..........................................................................................9

4. Description of Software..........................................................................................................10

5. Specifications of Driver APIs..................................................................................................12

6. Usage Notes..........................................................................................................................12

6.1 VCOM and SCS pin for MIP LCD.......................................................................................................... 12

6.2 DMAC Interrupts.................................................................................................................................... 12

6.3 Setting DMAC Transfer Source and Transfer Destination Addresses .................................................. 13

7. Troubleshooting.....................................................................................................................14

7.1 Occurrence of Build Error...................................................................................................................... 14

7.2 Occurrence of HardFault Error when API of CMSIS Driver Is Called ................................................... 14

7.3 Peripheral Function Fails to Operate when API Is Called ..................................................................... 14

7.4 Normal API Return Value But No Pin Output from Peripheral Function ............................................... 14

7.5 Peripheral Function’s Input or Output Does Not Operate as Expected ................................................ 14

8. Sample Code.........................................................................................................................14

9. Reference Documents ...........................................................................................................15

Revision History ............................................................................................................................16

Energy Harvesting Launch Operation Demo using Quick Start Mode Enabling Effective

MCU Utilization during Charging Time for RE01 256KB Group

R01AN5406EJ0100 Rev.1.00 Page 3 of 16

Aug. 25, 2020

1. What is Quick Start for Energy Harvesting Circuit for RE Family?

Quick start is a function that is unique to EHC circuit in RE Family. This function enables the users to

immediately use the device before the secondary battery is fully charged.

Quick start mode is especially useful when secondary battery is used together with EHC circuit. Depending on

the battery size, secondary battery charging from solar cell or other energy harvesting elements may take up

to several days. This function enables the users to skip this waiting time and to use the device as soon as the

power generated by the power generating element is available.

During the battery charging period, the product can also be easily mistaken as a broken product because the

users cannot see the status of the charging. By using quick start mode, the MCU can notify the users about

the status of the charging. In this demo, the status of the secondary battery charging is shown in SMIP during

the quick start period. The timing of the quick start mode is described in Figure 1.1.

Figure 1.1 Quick Start Timing

2. Specifications

2.1 Description of Project

A sample code project "r01an5406_re_ehc_quickstart_smip.zip" is delivered with this application note.

r01an5406_re_ehc_quickstart_smip.zip is a project which operation has been confirmed on the Evaluation Kit

RE01 256KB Board. This project is configured to match the settings of RE01 256KB (R7F0E01182CFP)

mounted on the Evaluation Kit RE01 256KB Board. When using another RE01 256KB device, change the

device settings in the project to those of the target device.

2.2 Overview

By using this sample code, the board can be powered up by an energy harvester (solar panel/thermoelectric

generator. The program will send image data to SMIP display, depending on the status of secondary battery

charging progress:

While waiting for the secondary battery to finish charging, the program sends image data to SMIP. The

images used while waiting for secondary battery charging are shown in Figure 2.1.

Energy Harvesting Launch Operation Demo using Quick Start Mode Enabling Effective

MCU Utilization during Charging Time for RE01 256KB Group

R01AN5406EJ0100 Rev.1.00 Page 4 of 16

Aug. 25, 2020

(a) during charging in quick start mode

(b) after charging is completed

Figure 2.1 SMIP Display during Quick Start Up Sequence

After the secondary battery is charged, the program goes to main.c and SMIP alternately shows the

original image and color-inverted image. The images are shown in Figure 2.2.

(a) Original Image

(b) Color-inverted Image

Figure 2.2 RE Logo in SMIP Display

The overview of the functions used in this program is shown below.

Energy Harvesting Launch Operation Demo using Quick Start Mode Enabling Effective

MCU Utilization during Charging Time for RE01 256KB Group

R01AN5406EJ0100 Rev.1.00 Page 5 of 16

Aug. 25, 2020

Figure 2.3 Program Overview

2.3 Pins Used

The pins used by the sample code are shown below.

Pin Used

Purpose of Use

P010

MOSIA_B (SPI)

P011

RSPCKA_B (SPI)

P015

SCS (SPI)

P813

RESET (SPI)

P814

VCOM (SPI)

PMOD1

DMAC

CPU

RE01

AGT1

SOS C

32.768 kHz

In ter rup t r eq uest

MOCO

2 MHz

P814

P813

P015

MIP LCD

VCOM

RESET

SCS

EHC

GDT

Input

OutputDMAC2

DMAC1

SPI

AGT0

In ter rup t r eq uest

DMAC0

P011

P010

RSPCK

MOSI

*LOCO is oscillating during EHC startup

Power generating elements

Solar panel Thermoelectric generator

Energy Harvesting Launch Operation Demo using Quick Start Mode Enabling Effective

MCU Utilization during Charging Time for RE01 256KB Group

R01AN5406EJ0100 Rev.1.00 Page 6 of 16

Aug. 25, 2020

2.4 Procedure for Operating Sample Code

Follow the steps described below to operate the sample code. Refer to the startup guide for more details of

how to build and download the program.

1. Build the sample code

2. Follow the board setting shown in Figure 2.4 before downloading the program *1

3. Connect the debugger and download the program to the MCU.

4. Disconnect the debugger.

5. Change the board setting before operating in energy harvesting mode *1

In this sample code, users can select either a solar panel or thermoelectric generator harvester as the

power generation element.

a. When using solar panel

Evaluation Kit RE01 256KB Board and a solar panel are required. Connect the required

components by following the setting shown in Figure 2.5.

b. When using thermoelectric generator harvester

Evaluation Kit RE01 256KB Board, thermoelectric generator harvester (sold separately), and

MERCURY Eval Board (sold separately) are required. Connect the required components by

following the setting shown in Figure 2.6

6. Start EHC operation

Sample program will start when power is supplied to the VSC_VCC pin from the power generation

elements.

7. Restarting EHC operation

After the charging of the secondary battery is completed, the program transitions to a steady-state

operation period and continuously inverse the image shown in the SMIP display. If the power supply to

the MCU is interrupted and the secondary battery does not have enough voltage to maintain operation,

the operation of the MCU is intentionally stopped. The MCU can automatically restart as soon as the

power from the power generation elements is re-supplied to the VSC_VCC pin. *2

Note: *1 The board setting and connection during program download, energy harvesting mode operation with

solar panel, and energy harvesting mode operation with thermoelectric generator harvester are

different. Be sure to follow the board setting described for each respective mode.

*2 The EHC circuit starts initial operation when there is a voltage difference between the VCC and

VCC/IOVCC pins. Therefore, if the discharging process of the charge on the VCC/IOVCC pins takes

a long time due to components connected to the VCC/IOVCC pins, etc., it is not possible to create a

voltage difference to start the initial operation of the EHC circuit. For this reason, design the circuit so

that the VCC/IOVCC pins are quickly discharged. The evaluation kit has a discharge switch (SW7 of

the RE01 256KB) that can be used manually for quick discharge at the prototype stage.

Energy Harvesting Launch Operation Demo using Quick Start Mode Enabling Effective

MCU Utilization during Charging Time for RE01 256KB Group

R01AN5406EJ0100 Rev.1.00 Page 7 of 16

Aug. 25, 2020

Do not connect

to PC

SW9 : MD 1

2 short

SW10:

EHMD

2 short

J15: 2

3 short

J6:

3 short

Power Generating

Element

( Solar Panel )

PMOD1: Connect to MIP LCD

J8: 2

3 short

SW3: EHC

SW4: EHC

SW5: EHC

SW6: EHC

J10:

2 open

3 open

J9: short

T10: + pole

T9: - pole

2.5 Jumper settings and power generator element connections

・Fig. 2.4 shows the board setting when downloading the program.

・Fig. 2.5 shows the board setting during energy harvesting operation (using solar panel)

・Fig. 2.6 shows the board setting during energy harvesting operation (using thermoelectric generator

harvester)

Figure 2.4 Board setting when downloading the program

Figure 2.5 Board setting during energy harvesting operation (using solar panel)

Energy Harvesting Launch Operation Demo using Quick Start Mode Enabling Effective

MCU Utilization during Charging Time for RE01 256KB Group

R01AN5406EJ0100 Rev.1.00 Page 8 of 16

Aug. 25, 2020

Figure 2.6 Board settings during energy harvesting operation (using thermoelectric generator

harvester)

This sample code can use a thermoelectric generator as a power generation element. A thermoelectric

generator is a device that uses temperature difference to generate electricity. In this demo, the power is

harvested from the temperature difference between human body and room temperature. To power up the

MCU, place a finger to the thermoelectric generator harvester.

To run the demonstration, connect the MERCURY Eval Board, thermoelectric generator harvester, and

Evaluation Kit RE01 256KB Board as shown in Figure. 2.6. Thermoelectric generator harvester harvests the

power generated from temperature difference between human body and room temperature. MERCURY Eval

Board is used to increase the voltage generated by the thermoelectric generator harvester to a level that can

support Evaluation Kit RE01 256KB Board operation.

Caution: Always check the electrical polarity of the cables when connecting the thermoelectric generator

harvester to MERCURY Eval Board. In the device used this demonstration (GEM-H071010), the

red wire is the negative pole and the black wire is the positive pole. Make sure to connect the

components according to its respective correct electrical pole.

Do not connect

to PC

SW9 : MD 1

2 short

SW10:

EHMD

2 short

J15: 2

3 short

J6:

3 short

J8: 2

3 short

SW3: EHC

SW4: EHC

SW5: EHC

SW6: EHC

J10:

2 open

3 open

J9: short

MERCURY Eval Board

(MCRY-EVALKIT)

Thermoelectric Generator Harvester

(GEM-H071010)

T10: + pole

T9: - pole

Caution:

Always check the electrical

polarity of this device

JP4

JP5

JP7

JP6

Energy Harvesting Launch Operation Demo using Quick Start Mode Enabling Effective

MCU Utilization during Charging Time for RE01 256KB Group

R01AN5406EJ0100 Rev.1.00 Page 9 of 16

Aug. 25, 2020

3. Conditions for Checking Operation

The operation of the sample code delivered with this application note has been checked under the following

conditions (Table 3-1).

Table 3-1 Conditions for Checking Operation

Item

Description

Microcontroller used

R7F0E01182CFP (RE01 256KB Group)

Operating frequency

ICLK: MOCO 2 MHz

PCLKB: MOCO 2MHz

Operating voltage

•3.3 V

Target board

Evaluation Kit RE01 256KB Board

Display

SMIP display (RTK70E015DB00000BE) *Included in the

Evaluation Kit

Solar energy harvester

Solar Panel (AM-1815CA) *Included in the Evaluation Kit

Thermoelectric generator harvester

Thermoelectric generation element (GEM-H071010)

MERCURY Eval Board (MCRY-EVALKIT)

Development

environment

GCC

e2studio 2020-07 made by Renesas Electronics

IAR

IAR Embedded Workbench for ARM Version 8.40.2.22891

C compiler

GCC

GCC ARM Embedded V6.3.1.20170620

GNU 6-2017-q2-update

IAR

IARC/C++ Compiler for ARM Version 8.40.2 or later

Version of I/O header

Rev. 1.00

Version of CMSIS driver package

Rev. 1.00

Energy Harvesting Launch Operation Demo using Quick Start Mode Enabling Effective

MCU Utilization during Charging Time for RE01 256KB Group

R01AN5406EJ0100 Rev.1.00 Page 10 of 16

Aug. 25, 2020

4. Description of Software

This sample code demonstrates EHC quick start up and operation powered by a solar panel. In EH mode,

users can choose to connect 2.4 V, 2.5 V, 2.6 V, 2.7 V, 2.8 V, 2.9 V, 3.0 V, and 3.1 V secondary battery or

super capacitor. Figure 4.1 shows the timing chart of this sample code when using 3.1 V secondary battery.

EH also has an overcharge protection circuit to prevent overcharging of the secondary battery connected to

the VBAT_EHC pin and the storage capacitor connected to the VCC_SU pin by the power generating element

connected to the VSC_VCC pin. In this sample code, the threshold voltage for charging protection of VBAT is

3.070 V (when 3.1 V VBAT charging voltage is used).

Figure 4.1 Timing Chart for EHC Operation (using 3.1 V secondary battery)

The sample code performs the following operations.

- When solar panel is connected to the board, the secondary battery charging period starts. During

secondary battery charging period, SMIP shows the status of the charging (Figure 2.1).

- After secondary battery charging is finished, the program goes to main file and sends image data to SMIP.

The display is toggled between original image and color-inverted image (Figure 2.2)

Figure 4.2 shows the program flow during the secondary battery charging period. Figure 4.3 shows the program

flow after going to main (after secondary battery charging period ends).

3.1 V

0 V

2.33 V

1.67 V

CPU

EH State

LCD Image

LVDBAT

Detection Level

LVD1

Detection Level 1.67 V

2.33 V

Energy Harvesting PG

(VSC pin)

VCC_SU

(Power Storage

Capacitor)

VCC

(Internal MCU)

VBAT_EHC pin

(Battery)

LVDBAT Interrupt

LVD1 Interrupt

OFF SSTBY

Providing Power

Charging battery

Quick Start

LVDBAT Interrupt

Steady operation

period

Not providing power

SSTBY Active SSTBY Active OFF

Active SSTBY

LVD1 Interrupt

Intermittent Operation

Operation

stopped

AGT1

interrupt

AGT1

interrupt

Power On

Reset

Quick Start

Providing Power

Acti

Charging

battery

SSTB

Active SSTBY

LVDBAT

Interrupt

Steady

operation

period

Reset release Reset release

2.60V

VCC_SU_H

Activ

Notes:

batc

: Secondary battery (VBAT) Charging Voltage

VCC_SU_H: Startup threshold voltage at the time of starting up the energy harvest mode

detBAT

: Voltage detection level for LVDBAT (voltage monitoring BAT) circuit

det

: Voltage detection level for LVD1 (voltage monitoring 1) circuit

POR

: Voltage detection level for power-on reset circuit

1.50 V

Reset Rese

AGT1

interrupt

POR

det

detBAT

batc

Not charging

(using power from battery)

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