ST72F324BJ STMICROELECTRONICS [STMicroelectronics], ST72F324BJ Datasheet - Page 18

• Manufacturer Part Number: ST72F324BJ
• Description: 8-bit MCU, 3.8 to 5.5 V operating range with 8 to 32 Kbyte Flash/ROM, 10-bit ADC, 4 timers, SPI, SCI
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Flash program memory
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Flash program memory
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 V
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 organization allows each sector to be erased and reprogrammed without
affecting other sectors.
Main features
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Structure
The Flash memory is organized 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
unnecessary 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
upper part of the ST7 addressing space so the reset and interrupt vectors are located in
Sector 0 (F000h-FFFFh).
Table 3.
3 Flash programming modes:
–
–
–
ICT (in-circuit testing) for downloading and executing user application test patterns in
RAM
Readout protection
Register Access Security System (RASS) to prevent accidental programming or
erasing
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 while the application is running.
Sectors available in Flash devices
Flash size (bytes)
(seeTable
>8K
4K
8K
3). Each of these sectors can be erased independently to avoid
PP
supply.
Figure
Available sectors
7). They are mapped in the
Sectors 0, 1, 2
Sectors 0, 1
Sector 0
ST72324B