Nuvoton 8051 ISP User manual

8051 ISP by COM Port

Nuvoton

8051 ISP by COM Port

User Manual

Revision 5.02, 2010/11/15

8051 ISP by COM Port

Contents

Revision History.......................................................................................................3

1 Introduction .........................................................................................................4

2 Hardware.............................................................................................................4

2.1 With an RS232 Transceiver in the Target System.........................................................................5

2.2 Without an RS232 Transceiver in the Target System....................................................................6

2.3 Requirement on the MCU’s Operating Frequency.........................................................................7

3 Software..............................................................................................................8

3.1 Install the Application Program ......................................................................................................8

3.2 Introduction to the Application Program.........................................................................................8

3.3 Auto Synchronization of APROM/DataFlash Buffer.......................................................................9

4 Operation Steps................................................................................................10

4.1 With Reset Control.......................................................................................................................10

4.2 Without Reset Control..................................................................................................................10

5 Reset Control....................................................................................................11

8051 ISP by COM Port

Revision History

Revision Description Date

v1.00 The first released version. 2009/07/15

v2.00

(1) Fix some minor bugs in AP.

(2) Modify the handshaking mechanism in linking to target system.

(3) The data in Code Buffer are refreshed when the “Update 8051” or “Verify 8051”

button is clicked.

2009/09/03

v2.01 (1) Update the display of part numbers W78E051D, W78E052D and W78E054D to

become W78E(I)051D, W78E(I)052D and W78E(I)054D, respectively.

(2) Fix a minor bug in Nuvoton standard ISP code. (The version is changed to v0201.) 2009/09/22

v3.00 (1) Add new parts: N78E366A, N78E055A, N78E059A and N78E517A.

(2) Use the integrated PC-site application program of ISP-ICP Programmer. 2010/02/10

v4.00 Update the PC-site AP version to v4.00. 2010/04/01

v4.01

(1) Fix a minor bug in Nuvoton standard ISP code for W925EP01, N78E366A,

N78E055A, N78E059A and N78E517A. (The version is updated to v3.12.)

(2) Add a new part: W925EP01.

(3) Update the PC-site AP version to v4.01.

2010/06/15

v5.00

(1) Improve data security of the Nuvoton standard ISP code for N78E366A, N78E055A,

N78E059A and N78E517A. (The version is updated to v3.13.)

(2) Update the PC-site AP to v5.00. (The GUI display for "CONFIG Setting" becomes

more user-friendly.)

2010/08/13

v5.02

(1) Fix the HEX-to-BIN conversion error when the hex input file has a binary code size

more than 64K. (The application program is updated to v5.02.)

(2) Modify all the ISP codes to prevent from hanging in LDROM during powered on in an

RS-485 application. (The version is updated to v3.20.)

2010/11/15

8051 ISP by COM Port

1 Introduction

ISP is the acronym of In-System Programming, which makes it possible that the user can update the program

memory under the software control without removing the mounted MCU chip from the actual end product. For the

8051 MCU products, we provide an ISP solution through the PC’s COM port. As long as the Nuvoton standard ISP

code is pre-programmed in the MCU’s LDROM, the user can easily update the MCU’s APROM through the PC’s

COM port.

Note:

The ISP function can work only when the ISP code has resided in MCU’s LDROM. To let users easily use the ISP function, some

of the 8051 MCU products have the “Nuvoton Standard ISP Code” pre-programmed in LDROM and CONFIG bits properly

configured before shipping. Please contact Nuvoton for detailed product information. (The “Nuvoton Standard ISP Code” is also

included in the folder [(3) Nuvoton Standard ISP Code]. The user may program it by himself using a universal programmer.)

2 Hardware

To make the 8051 MCU boot from LDROM after reset to run the ISP code, some specific I/O pins need to be tied to

ground and the CONFIG needs to be properly configured. The following table shows the specific I/O pins and the

proper CONFIG setting used for booting from LDROM after reset. In addition, to directly connect to PC’s COM port,

there needs an RS232 transceiver (e.g. MAX232) in the target system. The following sub-sections will show the

hardware connection.

I/O Pins and CONFIG Bit for Booting from LDROM after Reset

Part No. I/O Pins Tied to Ground for

Booting from LDROM CONFIG Setting for

Booting from LDROM

W78E(I)051D

W78E(I)052D

W78E(I)054D (Not Need) “CBS”

Selected as LDROM

(Boot from LDROM)

P2.6 & P2.7 (for 40-pin package) (Not Need)

W78E(I)058D

W78E(I)516D

W78E(L)365A

W78E065A

W78E858A P4.3 (for 44-pin package) (Not Need)

P2.6 & P2.7 (for 40-pin package) “Reboot P2.6/P2.7”

Enabled

W78E(I)RD2A

W77E(L)516A

W77E(L)532A

W79E(L)632A

W79E(L)633A

W79E(L)648A

W79E(L)649A

W79E(L)658A

W79E(L)659A

P4.3 (for 44/68/100-pin package) “Reboot P4.3”

Enabled

P3.6 & P3.7 (for 44-pin package) “Reboot P3.6/P3.7”

Enabled

W79E217A

W79E225A

W79E226A

W79E227A P4.3 (for 48/100-pin package) “Reboot P4.3”

Enabled

W79E201A P4.0

“Reboot P4.0”

Enabled

W925EP01 P4.7

“Reboot P4.7”

Enabled

N78E366A

N78E055A

N78E059A

N78E517A

(Not Need) “CBS”

Selected as LDROM

(Boot from LDROM)

8051 ISP by COM Port

2.1 With an RS232 Transceiver in the Target System

In this design, each target system has an RS232 transceiver (e.g. MAX232) inside, and so only one RS232 cable is

needed during the ISP operation, as shown below.

Note 2:

For "With Reset Control" configuration, Q1, R3 and R4 are needed.

For "Without Reset Control" configuration, Q1, R3 and R4 are not needed.

10p

1u/16V

VCC

RXD

COM Port

VCC

MAX232

C1+

C1-

C2+

C2-

T1_IN

T2_IN

R1_OUT

R2_OUT

V+

V-

T1_OUT

T2_OUT

R1_IN

R2_IN

GND

VCC

RTS

Note 1:

The I/O pins used for booting from LDROM may be P2.6&P2.7, P4.3, P3.6&P3.7, P4.0 or none.

(See the above table.)

P2.7

RST

VCC

RST

10K

RS232

Transceiver

RS232

Connector

P3.0(RXD)

RXD

TXD

Target System

10K

Fosc

DCD

P2.6 P3.1(TXD)

4.7K

10p

UART

Interface

8051 MCU

GND

CTS

Male DB9

GND

To boot fromLDROM.

(See Note 1)

47K

TXD

1u/16V

/EA

XTAL1

VCC

RS232 Cable

2N3906

XTAL2

1u/16V

For reset control.

(See Note 2)

DSR

(with RS232 Transceiver)

DTR

8051 ISP by COM Port

2.2 Without an RS232 Transceiver in the Target System

To save an RS232 transceiver (e.g. MAX232) built in each target system, the user may use the RS232 Cable

Adaptor with an RS232 transceiver inside, as shown below.

100

VCC

COM Port

DCD

(PL)

Note 1:

The I/O pins used for booting from LDROM may be P2.6&P2.7, P4.3, P3.6&P3.7, P4.0 or none.

(See the above table.)

MAX232

C1+

C1-

C2+

C2-

T1_IN

T2_IN

R1_OUT

R2_OUT

V+

V-

T1_OUT

T2_OUT

R1_IN

R2_IN

GND

VCC

1u/16V

DSR

1u/16V

CTS

(without RS232 Transceiver)

47K RXD

GND

10K

UART

Interface

Pulledlow

RST

4.7K

GND

To boot fromLDROM.

(See Note 1)

P2.7

1u/16V

DTR

8051 MCU

10p

P3.0

VCC

GND GND

RST

RTS

2N3906

RS232

Connector

RST

P3.0(RXD)

1u/16V

P2.6

10p

P2.6

TXD

XTAL2

Target System

VCC

/EA

General

Connector

RST

TXD

VCC

Male DB9

RST

P3.1

Fosc

For reset control.

(See Note 2)

RS232 Cable Adaptor

Note 2:

For "With Reset Control" configuration, Q1, R3 and R4 are needed.

For "Without Reset Control" configuration, Q1, R3 and R4 are not needed.

10K

RS232

Transceiver

P2.6

P2.7

RS232 Cable

XTAL1

VCC

P3.1(TXD)

P2.7

RXD

VCC

8051 ISP by COM Port

2.3 Requirement on the MCU’s Operating Frequency

There is no restriction on the MCU’s operating frequency for ISP operation. All frequencies between 3MHz and

40MHz are acceptable. The 8051 MCU will automatically build a proper baudrate according to its operating

frequency. It is recommended that the user uses the following specific frequencies: 11.0592MHz, 18.432MHz,

22.1184MHz or 36.864MHz. All these frequencies can generate the exact baudrate of 115200bps, which will shorten

the data transmission time during ISP operation.

8051 ISP by COM Port

3 Software

3.1 Install the Application Program

The application program setup file is contained in the folder [(2) Application Program]. Using the default installation

setting, you will find the item “Nuvoton Tools \ ISP-ICP Utility, v?.??” appearing in the Windows START-menu after

the application program is successfully installed.

Note:

ISP-ICP means this application program is used for both the ISP Programmer and the ICP Programmer.

In addition, also for the ISP by COM Port.

3.2 Introduction to the Application Program

8051 ISP by COM Port

3.3 Auto Synchronization of APROM/DataFlash Buffer

The buffer contents will be automatically synchronized with the physical file in the hard disk when the function button

'Update Chip' is clicked, as shown below. So, the user needn’t manually reload the files for APROM buffer and

DataFlash buffer when the physical files are updated externally.

Physical file in

the hard disk

Buffer Contents

Click 'Update Chip' will make

the buffers synchronized.

8051 ISP by COM Port

4 Operation Steps

4.1 With Reset Control

For the “With Reset Control” configuration, the user should follow the steps to do ISP.

Step 1: Connect the target system to PC’s COM port through an RS232 cable.

Step 2: Run the PC-site AP, select wanted part no., select correct COM port to which the target system is connected,

and load the code/data file into APROM/DataFlash Buffer.

Step 3: Click the “Update Chip” button when the target system is in power-on state.

Step 4: Now, the 8051 MCU will automatically reboot from LDROM, and will be successfully detected and updated.

Note: If possible, “With Reset Control” is strongly recommended for ISP operation.

4.2 Without Reset Control

For the “Without Reset Control” configuration, the user should follow the steps to do ISP.

Step 1: Connect the target system to PC’s COM port through an RS232 cable.

Step 2: Run the PC-site AP, select wanted part no., select correct COM port to which the target system is connected,

and load the code/data file into APROM/DataFlash Buffer.

Step 3: Click “Update Chip” button.

Step 4: Manually have the 8051 MCU reboot from LDROM during “Detect 8051…”, as shown in the following figure,

by the following two methods:

(1) send a reset pulse to the 8051 MCU’s RST-pin when the target system is in power-on state, or

(2) power off the target system and then power on again.

During detecting 8051, do the thing as Step4 describes.

Step 5: Now, the 8051 MCU will be successfully detected and updated.

Note:

(1) Step 4 shows the “Without Reset Control” is somewhat inconvenient for the user to have the 8051 MCU reboot

from LDROM. This is why we strongly recommend the user to adopt the “With Reset Control” configuration.

(2) If any failed condition happens, repeat steps 3 and 4.

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