ST7LITEUSX datasheet(11/108 Pages) STMICROELECTRONICS

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ST7LITEUSx

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4 FLASH PROGRAM MEMORY

4.1 Introduction

The ST7 single voltage extended Flash (XFlash) is

a non-volatile memory that can be electrically

erased and programmed either on a byte-by-byte

basis or up to 32 bytes in parallel.

The XFlash devices can be programmed off-board

(plugged in a programming tool) or on-board using

In-Circuit Programming or In-Application Program-

ming.

The array matrix organisation allows each sector

to be erased and reprogrammed without affecting

other sectors.

4.2 Main Features

■ ICP (In-Circuit Programming)

■ IAP (In-Application Programming)

■ ICT (In-Circuit Testing) for downloading and

executing user application test patterns in RAM

■ Sector 0 size configurable by option byte

■ Read-out and write protection

4.3 PROGRAMMING MODES

The ST7 can be programmed in three different

ways:

– Insertion in a programming tool. In this mode,

FLASH sectors 0 and 1 and option byte row

can be programmed or erased.

– In-Circuit Programming. In this mode, FLASH

sectors 0 and 1 and option byte row can be

programmed or erased without removing the

device from the application board.

– In-Application Programming. In this mode,

sector 1 can be programmed or erased with-

out removing the device from the application

board and while the application is running.

4.3.1 In-Circuit Programming (ICP)

ICP uses a protocol called ICC (In-Circuit Commu-

nication) which allows an ST7 plugged on a print-

ed circuit board (PCB) to communicate with an ex-

ternal programming device connected via cable.

ICP is performed in three steps:

– Switch the ST7 to ICC mode (In-Circuit Commu-

nications). This is done by driving a specific sig-

nal sequence on the ICCCLK/DATA pins while

the RESET pin is pulled low. When the ST7 en-

ters ICC mode, it fetches a specific RESET vec-

tor which points to the ST7 System Memory

containing the ICC protocol routine. This routine

enables the ST7 to receive bytes from the ICC in-

terface.

– Download ICP Driver code in RAM from the IC-

CDATA pin

– Execute ICP Driver code in RAM to program the

FLASH memory

Depending on the ICP Driver code downloaded in

RAM, FLASH memory programming can be fully

customized (number of bytes to program, program

locations, or selection of the serial communication

interface for downloading).

4.3.2 In Application Programming (IAP)

This mode uses an IAP Driver program previously

programmed in Sector 0 by the user (in ICP

mode).

This mode is fully controlled by user software. This

allows it to be adapted to the user application, (us-

er-defined strategy for entering programming

mode, choice of communications protocol used to

fetch the data to be stored etc.)

IAP mode can be used to program any memory ar-

eas except Sector 0, which is write/erase protect-

ed to allow recovery in case errors occur during

the programming operation.

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