ST7262_06 datasheet(15/139 Pages) STMICROELECTRONICS

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ST7262

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FLASH PROGRAM MEMORY (Cont’d)

4.4 ICC Interface

ICC needs a minimum of 4 and up to 6 pins to be

connected to the programming tool (see Figure 9).

These pins are:

– RESET: device reset

–VSS: device power supply ground

– ICCCLK: ICC output serial clock pin

– ICCDATA: ICC input/output serial data pin

– ICCSEL/VPP: programming voltage

– OSC1(or OSCIN): main clock input for exter-

nal source (optional)

–VDD: application board power supply (see Fig-

ure 9, Note 3)

Figure 9. Typical ICC Interface

Notes:

1. 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 de-

vice forces the signal. Refer to the Programming

Tool documentation for recommended resistor val-

ues.

2. During the ICC session, the programming tool

must control the RESET pin. This can lead to con-

flicts between the programming tool and the appli-

cation 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 appli-

cation RESET circuit in this case. When using a

classical RC network with R>1K or a reset man-

agement IC with open drain output and pull-up re-

sistor>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.

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

on the Programming Tool architecture. This pin

must be connected when using most ST Program-

ming Tools (it is used to monitor the application

power supply). Please refer to the Programming

Tool manual.

4. Pin 9 has to be connected to the OSC1 or OS-

CIN 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.

ICC CONNECTOR

HE10 CONNECTOR TYPE

APPLICATION

POWER SUPPLY

PROGRAMMING TOOL

ICC CONNECTOR

APPLICATION BOARD

ICC Cable

(See Note 3)

10k

Ω

ST7

CL2

CL1

OPTIONAL

See Note 1

See Note 2

APPLICATION

RESET SOURCE

APPLICATION

I/O

(See Note 4)

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