ST7L09 datasheet(12/104 Pages) STMICROELECTRONICS

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ST7L05, ST7L09

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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 organization 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, option byte row and

data EEPROM can be programmed or

erased.

– In-Circuit Programming. In this mode, Flash

sectors 0 and 1, option byte row and data

EEPROM can be programmed or erased with-

out removing the device from the application

board.

– In-Application Programming. In this mode,

sector 1 and data EEPROM can be pro-

grammed or erased without removing the de-

vice 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:

1. Switch the ST7 to ICC mode (In-Circuit Com-

munications). This is done by driving a specific

signal sequence on the ICCCLK/DATA pins

while the RESET pin is pulled low. When the

ST7 enters ICC mode, it fetches a specific

RESET vector which points to the ST7 System

Memory containing the ICC protocol routine.

This routine enables the ST7 to receive bytes

from the ICC interface.

2. Download ICP Driver code in RAM from the

ICCDATA pin

3. 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, al-

lowing it to adapt to the user application, (such as

user-defined strategy for entering programming

mode, choice of communications protocol used to

fetch the data to be stored).

IAP mode is used to program any memory areas

except Sector 0, which is Write/Erase protected to

allow recovery in case errors occur during the pro-

gramming operation.

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