ST STM8L-DISCOVERY User manual

September 2010 Doc ID 17693 Rev 1 1/29

UM0970

User Manual

STM8L-DISCOVERY

Introduction

The STM8L-DISCOVERY helps you to discover the STM8L ultralow power features and to

develop and share your applications. It is based on an STM8L152C6T6 and includes an ST-

Link embedded debug tool interface, LCD (24 segments, 4 commons), LEDs and push

buttons.

Figure 1. STM8L-DISCOVERY board

www.st.com

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Contents UM0970

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Contents

1 Quick start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.3 Development toolchain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.4 Demonstration software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.5 Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3 Hardware and layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.1 STM8L152C6T6 microcontroller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.2 Embedded ST-Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.2.1 Using the ST-Link to program/debug the STM8L on board . . . . . . . . . . 12

3.2.2 Using the ST-Link to program/debug an external STM8L application . . 12

3.3 Power supply and power selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.4 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.5 Push buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.6 Built-in IDD measurement circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.6.1 Run mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.6.2 Low power mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.6.3 Low power mode IDD measurement principle . . . . . . . . . . . . . . . . . . . . 15

3.6.4 Ibias current measurement procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.7 Solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.8 LCD (24 segments, 4 commons) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4 Extension connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5 Electrical schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

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UM0970 Quick start

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1 Quick start

The STM8L-DISCOVERY is a low-cost and easy-to-use development kit to quickly evaluate

and start a development with an STM8L ultralow power microcontroller.

Before installing and using the product, please accept the Evaluation Product License

Agreement from www.st.com/stm8l-discovery.

For more information on the STM8L-DISCOVERY and for demonstration software visit

www.st.com/stm8l-discovery.

1.1 Getting started

1. Check jumper positions on the board, JP1 and CN3 ON (Discovery selected).

2. Connect the STM8L-DISCOVERY board to a PC with a USB cable to power the board.

Red LED LD2 (PWR) then lights up.

3. Function 1 is executed and each click on user button B2 changes the executed function

as described in Ta b l e 1 .

To study or modify the DISCOVER project related to this demo, visit www.st.com/stm8l-

discovery and follow the tutorial. Discover the STM8L features, download and execute

programs proposed in the list of projects. This site also contains examples from which you

can develop your own applications.

1.2 System requirements

●Windows PC (2000, XP, Vista)

●A/Mini-B USB cable

Table 1. Functions

Function LED LD3/4 Bars Value displayed

1 Blink STM8L VDD voltage measured

2 Off STM8L consumption measured in Run mode

3 Off STM8L consumption measured in Low power mode, LCD on

4 Off STM8L consumption measured in Low power mode, LCD off

5 Off STM8L consumption measured in Halt mode, LCD off

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Quick start UM0970

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1.3 Development toolchain

●IAR, Embedded Workbench® for STM8

●STMicroelectronics, ST Visual Develop (STVD)

1.4 Demonstration software

Demonstration software is preloaded in the board's Flash memory. This demonstration uses

the built-in IDD measurement feature of the STM8L-DISCOVERY to automatically measure

and display on the LCD the consumption of the MCU in run and low power modes.

The latest versions of this demonstration source code and associated documentation can

be downloaded from www.st.com/stm8l-discovery.

1.5 Order code

To order the STM8L ultralow power Discovery, use the order code STM8L-DISCOVERY.

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UM0970 Features

Doc ID 17693 Rev 1 5/29

2 Features

The STM8L-DISCOVERY offers the following features:

●STM8L152C6T6 microcontroller, 32 KB Flash, 2 KB RAM, 1 KB EEPROM in 48-pin

LQFP

●On-board ST-Link with selection mode switch to use the kit as a stand-alone ST-Link

(with SWIM connector for programming and debugging)

●Two red LEDs; LD1 for USB communication, LD2 for 3.3 V power on

●Designed to be powered by USB or an external supply of 5 V or 3.3 V

●Can supply target application with 5 volts and 3 volts

●Two user LEDs, LD3 and LD4 (green and blue)

●Two push buttons (User and Reset)

●IDD current measurement

●LCD 28-pin DIP (24 segments, 4 commons)

●Extension header for all QFP48 I/Os for quick connection to prototyping board for easy

probing

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Hardware and layout UM0970

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3 Hardware and layout

The STM8L-DISCOVERY is designed around the STM8L152C6T6 microcontroller in a 48-

pin LQFP package.

Figure 2 illustrates the connections between the STM8L152C6T6 and its peripherals (ST-

Link, push button, LED, LCD and connectors).

Figure 3 and Figure 4 help you to locate these features on the STM8L-DISCOVERY.

Figure 2. Hardware block diagram

Blue LED

LD4

USER

I/O

Mini

USB

Green LED

LD3

RST

RESET

I/OI/O

P1 Header

P3Header

P2 Header

SWIM

LCD (24 segments, 4 commons)

IDD

measurement

Embedded

ST-LINK

STM8L152C6T6

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UM0970 Hardware and layout

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Figure 3. Top layout

ST-Link

LCD 24 segments

IDD measurement

STM8L152C6T6

CN2

JP1

LD3 LD4

CN3

IDD module

LD1

LD2

User button

LED blue

Reset button

LED green

SWIM connector

COM

power

SB1,2

X2 crystal

D2 diode

D1 diode

ST-Link/Discovery

selector

+3.3V power supply

input

+5V

power supply

input

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Hardware and layout UM0970

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Figure 4. Bottom layout

SB4,6,8,10

PRG-32

SB3,5,7,9

DEFAULT

SB11,12,14

SB13,15

SB16

SB17

IDD_Measurement

B2-USER

B1-RESET

X3 crystal

connector

JP1

IDD

(RESERVED)

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UM0970 Hardware and layout

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3.1 STM8L152C6T6 microcontroller

This 8-bit ultralow power MCU has 32 KB Flash, 2 KB RAM, 1 KB data EEPROM, RTC,

LCD, timers, USART, I2C, SPI, ADC, DAC and comparators.

Figure 5. STM8L152C6T6 package

This device provides the following benefits:

●Ultralow power proprietary 130 nm technology:

Speed and power consumption independent of MCU power supply, Ultralow leakage

●Ultralow power design (clock gating, low-power Flash with power-off capability):

Reduced overall Run and Wait mode current consumption by turning off clocks of

unused peripherals or Flash

●Sub 1 µA hardware RTC and AWU system unit:

Ultralow power modes for applications requesting regular wake up

●Range of Low power modes (up to 4):

Suitable for many applications from complete switch off to continuous monitoring at

ultralow frequency

●Advanced and flexible clock system (multiple internal and external clock sources):

Switch and adjust frequency and clock sources on the fly depending on application

needs

●Direct memory access on board (4-channel DMA):

Autonomy for peripherals, independent from core; can switch off Flash memory and

CPU (large current consumption contributors) while keeping peripherals active

●Ultralow power and ultrasafe reset system POR/PDR; additional optional activation

BOR:

Integrated safety and security for application

●Ultrafast wakeup from lowest Low power mode (4 µs):

Fast switching from Static and Dynamic power modes

●Analog functional down to 1.8 V, programming down to 1.65 V:

Full functionality over the complete VDD range

For more information see the STM8L152C6T6 datasheet (Doc ID 15962) on the ST website.

The STM8L152C6T6 8-bit microcontroller offers:

2 Kbytes RAM

32 Kbytes of Flash memory

LQFP48 7 x 7 mm

1 Kbytes EEPROM

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Hardware and layout UM0970

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Figure 6. STM8L152C6T6 block diagram

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