ST72361AR4-Auto datasheet(32/279 Pages) STMICROELECTRONICS

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Flash program memory

ST72361xx-Auto

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Doc ID 12468 Rev 3

Figure 7.

Typical ICC interface

Note:

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.

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

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

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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