ST7SCR_07 datasheet(16/101 Pages) STMICROELECTRONICS

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ST7SCR

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FLASH PROGRAM MEMORY (Cont’d)

4.4 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 9). For more details on

the pin locations, refer to the device pinout de-

scription.

ICP needs six signals to be connected to the pro-

gramming tool. These signals are:

–VSS: device power supply ground

–VDD: for reset by LVD

– OSCIN: to force the clock during power-up

– ICCCLK: ICC output serial clock pin

– ICCDATA: ICC input serial data pin

–VPP: ICC mode selection and programming

voltage.

If ICCCLK or ICCDATA are used for other purpos-

es in the application, a serial resistor has to be im-

plemented to avoid a conflict in case one of the

other devices forces the signal level.

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.

4.5 IAP (In-Application Programming)

This mode uses a BootLoader program previously

stored in Sector 0 by the user (in ICP mode or by

plugging the device in a programming tool).

This mode is fully controlled by user software. This

allows it to be adapted to the user application, (us-

er-defined strategy for entering programming

mode, choice of communications protocol used to

fetch the data to be stored, etc.). For example, it is

possible to download code from the USB interface

and program it in the Flash. IAP mode can be used

to program any of the Flash sectors except Sector

0, which is write/erase protected to allow recovery

in case errors occur during the programming oper-

ation.

Figure 9. Typical ICP Interface

ICP PROGRAMMING TOOL CONNECTOR

10k

Ω

CL2

CL1

ST7

HE10 CONNECTOR TYPE

4.7k

Ω

APPLICATION BOARD

PROGRAMMING TOOL

ICC CONNECTOR

ICC Cable

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