ST7SCR_07 datasheet(15/101 Pages) STMICROELECTRONICS

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ST7SCR

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4 FLASH PROGRAM MEMORY

4.1 Introduction

The ST7 dual voltage High Density Flash (HD-

Flash) is a non-volatile memory that can be electri-

cally erased as a single block or by individual sec-

tors and programmed on a Byte-by-Byte basis us-

ing an external VPP supply.

The HDFlash devices can be programmed and

erased off-board (plugged in a programming tool)

or on-board using ICP (In-Circuit Programming) or

IAP (In-Application Programming).

The array matrix organisation allows each sector

to be erased and reprogrammed without affecting

other sectors.

4.2 Main Features

■ Three Flash programming modes:

– Insertion in a programming tool. In this mode,

all sectors including option bytes can be pro-

grammed or erased.

– ICP (In-Circuit Programming). In this mode, all

sectors including option bytes can be pro-

grammed or erased without removing the de-

vice from the application board.

– IAP (In-Application Programming) In this

mode, all sectors except Sector 0, can be pro-

grammed or erased without removing the de-

vice from the application board and while the

application is running.

■ ICT (In-Circuit Testing) for downloading and

executing user application test patterns in RAM

■ Read-out protection

■ Register Access Security System (RASS) to

prevent accidental programming or erasing

4.3 Structure

The Flash memory is organised in sectors and can

be used for both code and data storage.

Depending on the overall FLASH memory size in

the microcontroller device, there are up to three

user sectors (see Table 4). Each of these sectors

can be erased independently to avoid unneces-

sary erasing of the whole Flash memory when only

a partial erasing is required.

The first two sectors have a fixed size of 4 Kbytes

(see Figure 8). They are mapped in the upper part

of the ST7 addressing space so the reset and in-

terrupt vectors are located in Sector 0 (F000h-

FFFFh).

Table 4. Sectors available in FLASH devices

Figure 8. Memory map and sector address

Flash Memory Size

(bytes)

Available Sectors

Sector 0

Sectors 0,1

> 8K

Sectors 0,1, 2

4 Kbytes

SECTOR 1

SECTOR 0

SECTOR 2

16K USER FLASH MEMORY SIZE

FFFFh

F000h

EFFFh

E000h

DFFFh

C000h

8Kbytes

ex.: user program

ex.: user data

ex.: user system library

+ IAP BootLoader

+ library

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