ST7FLITEU05B3 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST7FLITEU05B3

8-bit MCU with single voltage Flash memory, ADC, timers

STMicroelectronics 

ST7LITEU05 ST7LITEU09

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 (see note

1)

– ICCDATA: ICC input serial data pin

– CLKIN: main clock input for external source

–

NVDoDte:

application

3)

board

power

supply

(see

Figure 6. Typical ICC Interface

PROGRAMMING TOOL

ICC CONNECTOR

ICC Cable

(See Note 3)

ICC CONNECTOR

HE10 CONNECTOR TYPE

OPTIONAL

(See Note 4)

9 7 5 31

APPLICATION BOARD

10 8 6 4 2

3.3kΩ

(See Note 5)

APPLICATION

RESET SOURCE

See Note 2

APPLICATION

POWER SUPPLY

See Note 1 and Caution APPLICATION

See Note 1

I/O

ST7

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 pin of

the ST7 when ICC mode is selected with option

bytes disabled (35-pulse ICC entry mode). When

option bytes are enabled (38-pulse ICC entry

mode), the internal RC clock is forced, regardless

of the selection in the option byte.

12/115

1

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