ST72325AR7-Auto datasheet(36/243 Pages) STMICROELECTRONICS

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Flash program memory

ST72325xxx-Auto

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Doc ID 13770 Rev 3

Figure 7.

Typical ICC interface

If the ICCCLK or ICCDATA pins are only used as outputs in the application, no signal isolation is necessary. As soon as the

programming tool 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. If they are used as inputs by the application, isolation such as a serial resistor has to

implemented in case another device forces the signal. Refer to the programming tool documentation for recommended

resistor values.

During the ICC session, the programming tool must control the RESET pin. This can lead to conflicts between the

programming tool and the application reset circuit if it drives more than 5mA at high level (push-pull output or pull-up

resistor < 1K). A schottky diode can be used to isolate the application RESET circuit in this case. When using a classical

RC network with R > 1K or a reset management IC with open-drain output and pull-up resistor > 1K, no additional

components are needed. In all cases the user must ensure that no external reset is generated by the application during the

ICC session.

The use of Pin 7 of the ICC connector depends on the programming tool architecture. This pin must be connected when

using most ST programming tools (it is used to monitor the application power supply). Please refer to the programming tool

manual.

Pin 9 has to be connected to the OSC1 or OSCIN pin of the ST7 when the clock is not available in the application or if the

selected clock option is not programmed in the option byte. ST7 devices with multi-oscillator capability need to have OSC2

grounded in this case.

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

customized (number of bytes to program, program locations, or selection serial

communication interface for downloading).

When using an STMicroelectronics or third-party programming tool that supports ICP and

the specific microcontroller device, the user needs only to implement the ICP hardware

interface on the application board (see Figure 7). For more details on the pin locations, refer

to the device pinout description.

ICC CONNECTOR

HE10 CONNECTOR TYPE

APPLICATION

POWER SUPPLY

PROGRAMMING TOOL

ICC CONNECTOR

APPLICATION BOARD

ICC Cable

(See Note 3)

10k



ST7

CL2

CL1

OPTIONAL

See Note 1

See Note 2

APPLICATION

RESET SOURCE

APPLICATION

I/O

(See Note 4)

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