ST7265X datasheet(23/166 Pages) STMICROELECTRONICS

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ST7265x

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FLASH PROGRAM MEMORY (Cont’d)

4.5 ICP (In-Circuit Programming)

To perform ICP the microcontroller must be

switched to ICC (In-Circuit Communication) mode

by an external controller or programming tool.

Depending on the ICP code downloaded in RAM,

Flash memory programming can be fully custom-

ized (number of bytes to program, program loca-

tions, or selection serial communication interface

for downloading).

When using an STMicroelectronics or third-party

programming tool that supports ICP and the spe-

cific microcontroller device, the user needs only to

implement the ICP hardware interface on the ap-

plication board (see Figure 13). For more details

on the pin locations, refer to the device pinout de-

scription.

ICP needs six pins to be connected to the pro-

gramming tool. These pins are:

– RESET: device reset

–VSS: device power supply ground

– ICCCLK: ICC output serial clock pin

– ICCDATA: ICC input serial data pin

– ICCSEL/VPP: programming voltage

–VDD: application board power supply

CAUTIONS:

1. If RESET, ICCCLK or ICCDATA pins are used

for other purposes in the application, a serial resis-

tor has to be implemented to avoid a conflict in

case one of the other devices forces the signal lev-

el. If these pins are used as outputs in the applica-

tion, the serial resistors are not necessary. As

soon as the external controller is plugged to the

board, even if an ICC session is not in progress,

the ICCCLK and ICCDATA pins are not available

for the application.

2. The use of Pin 7 of the ICC connector depends

on the Programming Tool architecture. Please re-

fer to the documentation of the tool. This pin must

be connected when using ST Programming Tools

(it is used to monitor the application power supply).

Note: To develop a custom programming tool, re-

fer to the ST7 Flash Programming and ICC Refer-

ence Manual which gives full details on the ICC

protocol hardware and software.

Figure 13. Typical ICP Interface

ICC CONNECTOR

HE10 CONNECTOR TYPE

>4.7k

Ω

APPLICATION

POWER SUPPLY

OPTIONAL (SEE CAUTION 1)

PROGRAMMING TOOL

ICC CONNECTOR

APPLICATION BOARD

ICC Cable

OPTIONAL

(SEE CAUTION 2)

10k

Ω

ST7

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