ST7FLCD1 datasheet(28/95 Pages) STMICROELECTRONICS

28 / 95 page

Flash Program Memory

ST7FLCD1

28/95

Flash Program Memory

5.1

Introduction

The ST7 dual voltage High Density Flash (HDFlash) is a non-volatile memory 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.

HDFlash devices can be programmed and erased off-board (plugged in a programming tool) or on-

board using In-Circuit Programming (ICP) and In-Application Programming (IAP).

The array matrix organization allows each sector to be erased and reprogrammed without affecting

other sectors.

5.2

Main Features

●

Three Flash programming modes:

- Insertion in a programming tool. In this mode, all sectors including option bytes can be

programmed or erased.

- ICP (In-Circuit Programming). In this mode, all sectors including option bytes can be

programmed or erased without removing the device from the application board.

- IAP (In-Application programming). In this mode, all sectors except Sector 0 can be

programmed or erased without removing the device from the application board and when the

application is running.

●

ICT (In-Circuit Testing) for downloading and executing user application test patterns in RAM

●

Read-out protection against piracy

●

5.3

Structure

The Flash memory is organized in sectors and can be used for both code and data storage.

Depending on the overall size of the Flash memory in the microcontroller device, three user sectors

are available. Each sector is independently erasable. Thus, having to completely erase the entire

Flash memory is not necessary when only partial erasing is required.

The first two sectors have a fixed size of 4 Kbytes (see Figure 11). They are mapped in the upper

part of the ST7 addressing space. The reset and interrupt vectors are located in Sector 0 (F000h to

FFFFh).

5.4

Program Memory Read-out Protection

The read-out protection is enabled through an option bit.

When this option is selected, the programs and data stored in the program memory (Flash or ROM)

are protected against read-out piracy (including a re-write protection). In Flash devices, when this

protection is removed by reprogramming the Option Byte, the entire program memory is first

automatically erased. Refer to the Section 5.8 for more details.

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