ST72P623 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72P623

LOW SPEED USB 8-BIT MCU WITH 3 ENDPOINTS, FLASH OR ROM MEMORY, LVD, WDG, 10-BIT ADC, 2 TIMERS, SCI, SPI

STMicroelectronics 

ST7262xxx

FLASH PROGRAM MEMORY (Cont’d)

4.4 ICC INTERFACE

ICC (In-Circuit Communication) needs a minimum

of four and up to six 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)

– uVrDeD9: ,aNppoltieca3ti)on board power supply (see Fig-

Figure 9. Typical ICC Interface

PROGRAMMING TOOL

ct(s) (See Note 3)

solete Produ APPLICATION

CL2

t(s) - Ob POWER SUPPLY

OPTIONAL

(See Note 4)

CL1

ICC CONNECTOR

ICC Cable

APPLICATION BOARD

ICC CONNECTOR

HE10 CONNECTOR TYPE

9 7 5 31

10 8 6 4 2

APPLICATION

RESET SOURCE

See Note 2

10kΩ

See Note 1

APPLICATION

I/O

ST7

roduc Notes:

P 1. If the ICCCLK or ICCDATA pins are only used

te as outputs in the application, no signal isolation is

le necessary. As soon as the Programming Tool is

plugged to the board, even if an ICC session is not

o in progress, the ICCCLK and ICCDATA pins are

bs not available for the application. If they are used as

O inputs by the application, isolation such as a serial

agement IC with open drain output and pull-up

resistor > 1K, no additional components are need-

ed. In all cases the user must ensure that no exter-

nal 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

resistor has to implemented in case another de- must be connected when using most ST Program-

vice forces the signal. Refer to the Programming ming Tools (it is used to monitor the application

Tool documentation for recommended resistor val- power supply). Please refer to the Programming

ues.

Tool manual.

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

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 multioscillator capability need to have OSC2

grounded in this case.

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

Doc ID 6996 Rev 5

15/139

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