ST7LITE2 datasheet(13/133 Pages) STMICROELECTRONICS

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ST7LITE2

13/133

FLASH PROGRAM MEMORY (Cont’d)

4.4 ICC interface

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

connected to the programming tool. These pins

are:

– RESET: device reset

–VSS: device power supply ground

– ICCCLK: ICC output serial clock pin

– ICCDATA: ICC input serial data pin

– CLKIN/PB4: main clock input for external

source

–VDD: application board power supply (option-

al, see Note 3)

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 be implemented in case another de-

vice forces the signal. Refer to the Programming

Tool documentation for recommended resistor val-

ues.

2. During the ICP 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 CLKIN/PB4 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 OSC1 and

OSC2 grounded in this case.

5. With any programming tool, while the ICP option

is disabled, the external clock has to be provided

on PB4.

Caution: During normal operation the ICCCLK pin

must be pulled- up, internally or externally (exter-

nal pull-up of 10k mandatory in noisy environ-

ment). This is to avoid entering ICC mode unex-

pectedly during a reset. In the application, even if

the pin is configured as output, any reset will put it

back in input pull-up.

Figure 5. Typical ICC Interface

ICC CONNECTOR

HE10 CONNECTOR TYPE

APPLICATION

POWER SUPPLY

PROGRAMMING TOOL

ICC CONNECTOR

APPLICATION BOARD

ICC Cable

(See Note 3)

ST7

OPTIONAL

See Note 1 and Caution

See Note 2

APPLICATION

RESET SOURCE

APPLICATION

I/O

(See Note 4)

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