ST72P611F1B1 データシートの表示（PDF） - STMicroelectronics

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ST72P611F1B1

LOW SPEED USB 8-BIT MCU WITH 3 ENDPOINTS, FLASH MEMORY, LVD, WDG, TIMER

STMicroelectronics 

ST7261

3 FLASH PROGRAM MEMORY

3.1 Introduction

The ST7 dual voltage Flash is a non-volatile mem-

ory that can be electrically erased as a single block

or by individual sectors and programmed on a

Byte-by-Byte basis using an external VPP supply.

The Flash devices can be programmed and

erased off-board (plugged in a programming tool)

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

The array matrix organisation allows each sector

to be erased and reprogrammed without affecting

other sectors.

3.2 Main Features

s Two 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.

s ICT (In-Circuit Testing) for downloading and

executing user application test patterns in RAM

s Read-out protection against piracy

s Register Access Security System (RASS) to

prevent accidental programming or erasing

3.3 Structure

The Flash memory is organised in sectors and can

be used for both code and data storage.

Figure 6. Memory Map and Sector Address

Depending on the overall FLASH memory size in

the microcontroller device, there are up to three

user sectors (see Table 3). 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 6). 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 3. Sectors available in FLASH devices

Flash Memory Size

(bytes)

4K

8K

> 8K

Available Sectors

Sector 0

Sectors 0,1

Sectors 0,1, 2

3.4 Program Memory Read-out Protection

The read-out protection is enabled through an op-

tion bit.

For Flash devices, when this option is selected,

the program and data stored in the program mem-

ory (Flash or ROM) are protected against read-out

piracy (including a re-write protection). In Flash

devices, when this protection is removed by repro-

gramming the Option Byte, the entire program

memory is first automatically erased.

Refer to the Option Byte description for more de-

tails.

4K

1000h

3FFFh

7FFFh

9FFFh

BFFFh

D7FFh

DFFFh

EFFFh

FFFFh

8K

10K

16K

24K

32K

48K

60K

DV FLASH

MEMORY SIZE

2 Kbytes

8 Kbytes 16 Kbytes 24 Kbytes 40 Kbytes 52 Kbytes

4 Kbytes

4 Kbytes

SECTOR 2

SECTOR 1

SECTOR 0

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