ST7PLITE35F2B6TR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST7PLITE35F2B6TR

8-bit MCU with single voltage Flash, data EEPROM, ADC, timers, SPI, LINSCI™

STMicroelectronics 

ST7LITE3xF2

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

– aVlD, Ds:eeapNpolitceat3io) n board power supply (option-

Figure 5. Typical ICC Interface

(See Note 3)

PROGRAMMING TOOL

ICC CONNECTOR

ICC Cable

ICC CONNECTOR

HE10 CONNECTOR TYPE

OPTIONAL

(See Note 4)

9 7 5 31

10 8 6 4 2

APPLICATION BOARD

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 if another device

forces the signal. Refer to the Programming Tool

documentation for recommended resistor values.

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 must be connected to the PB4 pin of the

ST7 when the clock is not available in the applica-

tion or if the selected clock option is not pro-

grammed in the option byte. ST7 devices with

multi-oscillator capability must have OSC2

grounded in this case.

5. With any programming tool, while the ICP option

is disabled, the external clock must be provided on

PB4.

6. In 38-pulse ICC mode, the internal RC oscillator

is forced as a clock source, regardless of the se-

lection in the option byte. For ST7LITE30 devices

which do not support the internal RC oscillator, the

“option byte disabled” mode must be used (35-

pulse ICC mode entry, clock provided by the tool).

Caution: During normal operation ICCCLK pin

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

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

ment). This avoids entering ICC mode

unexpectedly during a reset. In the application,

even if the pin is configured as output, any reset

puts it back in input pull-up.

13/173

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