
Flash program memory ST72321xx-Auto
30/243 Doc ID 13829 Rev 1
Figure 5. Memory map and sector address
4.3.1 Readout protection
Readout protection, when selected, provides a protection against program memory content
extraction and against write access to Flash memory. Even if no protection can be
considered as totally unbreakable, the feature provides a very high level of protection for a
general purpose microcontroller.
In Flash devices, this protection is removed by reprogramming the option. In this case, the
entire program memory is first automatically erased and the device can be reprogrammed.
Note:
4.4 ICC interface
ICC needs a minimum of 4 and up to 6 pins to be connected to the programming tool (see
Figure 6). These pins are:
RESET
: device reset
V
SS
: device power supply ground
ICCCLK: ICC output serial clock pin
ICCDATA: ICC input/output serial data pin
ICCSEL/V
PP
: programming voltage
OSC1 (or OSCIN): main clock input for external source (optional)
V
DD
: application board power supply (optional, see Figure 6, Note 3)
4 Kbytes
4 Kbytes
2Kbytes
SECTOR 1
SECTOR 0
16 Kbytes
SECTOR 2
8K 16K 32K 60K
FLASH
FFFFh
EFFFh
DFFFh
3FFFh
7FFFh
1000h
24 Kbytes
MEMORY SIZE
8Kbytes 40 Kbytes
52 Kbytes
9FFFh
BFFFh
D7FFh
4K 10K 24K 48K
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