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ST72P63BE1M1 Datasheet(PDF) 17 Page - STMicroelectronics

Part No. ST72P63BE1M1
Description  Low speed USB 8-bit MCU family with up to 32K Flash/ROM, DFU capability, 8-bit ADC, WDG, timer, SCI & I²C
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST72P63BE1M1 Datasheet(HTML) 17 Page - STMicroelectronics

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4 Flash program memory
4.1 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 individu-
al sectors and programmed on a byte-by-byte ba-
sis using 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.Main features
3 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
4.2 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 6). Each of these sectors can
be erased independently to avoid 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 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 6. Sectors available in Flash devices
4.2.1 Read-Out protection
Read-Out protection, when selected, provides a
protection against Program Memory content ex-
traction and against write access to Flash memo-
ry. Even if no protection can be considered as to-
tally unbreakable, the feature provides a very high
level of protection for a general purpose microcon-
troller.
In Flash devices, this protection is removed by re-
programming the option. In this case, the entire
program memory is first automatically erased and
the device can be reprogrammed.
Read-Out protection selection depends on the de-
vice type:
– In Flash devices it is enabled and removed
through the FMP_R bit in the option byte.
– In ROM devices it is enabled by mask option
specified in the Option List.
Flash size (bytes)
Available sectors
4K
Sector 0
8K
Sectors 0,1
> 8K
Sectors 0,1, 2


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