ST72611F1M1 データシートの表示（PDF） - STMicroelectronics

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ST72611F1M1

LOW SPEED USB 8-BIT MCU WITH 3 ENDPOINTS, FLASH MEMORY, LVD, WDG, TIMER

STMicroelectronics 

ST7261

FLASH PROGRAM MEMORY (Cont’d)

3.5 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 7). For more details on

the pin locations, refer to the device pinout de-

scription.

ICP needs five signals to be connected to the pro-

gramming tool. These signals are:

– RESET: device reset

– VSS: device power supply ground

– ICCCLK: ICC output serial clock pin

– ICCDATA: ICC input serial data pin

– VPP: programming voltage

When the device is not yet configured to support

the application clock source (option byte not yet

programmed) or if the option bytes have to be pro-

grammed using ICP, one more pin has to be con-

nected:

– OSCIN: main clock input for external source

When the device is not supplied (VDD) by the ap-

plication, one more pin has to be connected:

– VDD: main 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.

2. 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.

Note: To develop a custom programming tool, re-

fer to the ST7 FLASH Programming and ICC Ref-

erence Manual which gives full details on the ICC

protocol hardware and software.

Figure 7. Typical ICP Interface

ICP PROGRAMMING TOOL CONNECTOR

HE10 CONNECTOR TYPE

1

APPLICATI ON

BOARD

CL2

10kΩ

CL1

ST7

4.7kΩ

TO

THE

APPLICATION

12/71

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