ST7FLITE25F2M6 datasheet(20/166 Pages) STMICROELECTRONICS

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Flash program memory

ST7LITE20F2 ST7LITE25F2 ST7LITE29F2

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Doc ID 8349 Rev 5

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 programming.

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 (if present) can be programmed or erased.

●

In-circuit programming. In this mode, Flash sectors 0 and 1, option byte row and data

EEPROM (if present) can be programmed or erased without removing the device from

the application board.

●

In-application programming. In this mode, sector 1 and data EEPROM (if present) can

be programmed or erased without 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 communication) which allows an ST7 plugged on a

printed circuit board (PCB) to communicate with an external programming device connected

via cable. ICP is performed in three steps:

Switch the ST7 to ICC mode (in-circuit communications). 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.

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