ST72264G1 STMicroelectronics, ST72264G1 Datasheet - Page 16
ST72264G1
Manufacturer Part Number
ST72264G1
Description
8-BIT MCU WITH FLASH OR ROM MEMORY, ADC, TWO 16-BIT TIMERS, I2C, SPI, SCI INTERFACES
Manufacturer
STMicroelectronics
Datasheet
1.ST72262G2.pdf
(172 pages)
Specifications of ST72264G1
4 K Or 8 Kbytes Program Memory
ROM or single voltage extended Flash (XFlash) with read-out protection, write protection, In-Circuit Programming and In-Application Programming (ICP and IAP). 10K write/erase cycles guaranteed, data retention
Clock Sources
crystal/ceramic resonator oscillators, internal RC oscillator and bypass for external clock
4 Power Saving Modes
Halt, Active Halt,Wait and Slow
Two 16-bit Timers With
2 input captures, 2 output compares, external clock input on one timer, PWM and Pulse generator modes
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ST72260Gx, ST72262Gx, ST72264Gx
FLASH PROGRAM MEMORY (Cont’d)
4.5 Memory Protection
There are two different types of memory protec-
tion: Read Out Protection and Write/Erase Protec-
tion which can be applied individually.
4.5.1 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 program
memory is 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
– In ROM devices it is enabled by mask option
4.5.2 Flash Write/Erase Protection
Write/erase protection, when set, makes it impos-
sible to both overwrite and erase program memo-
ry. Its purpose is to provide advanced security to
applications and prevent any change being made
to the memory content.
Warning: Once set, Write/erase protection can
never be removed. A write-protected flash device
is no longer reprogrammable.
Write/erase protection is enabled through the
FMP_W bit in the option byte.
16/172
through the FMP_R bit in the option byte.
specified in the Option List.
4.6 Related Documentation
For details on Flash programming and ICC proto-
col, refer to the ST7 Flash Programming Refer-
ence Manual and to the ST7 ICC Protocol Refer-
ence Manual
AN1477: Emulated data EEPROM with XFlash
memory
AN1576: IAP drivers for ST7 HDFlash or XFlash
MCUs
AN1575: On Board Programming methods for ST7
HDFlash or XFlash MCUs
AN1070: Checksum self checking capability
4.7 Register Description
FLASH CONTROL/STATUS REGISTER (FCSR)
Read/Write
Reset Value: 000 0000 (00h)
1st RASS Key: 0101 0110 (56h)
2nd RASS Key: 1010 1110 (AEh)
Note: This register is reserved for programming
using ICP, IAP or other programming methods. It
controls the XFlash programming and erasing op-
erations.
When an EPB or another programming tool is
used (in socket or ICP mode), the RASS keys are
sent automatically.
7
0
0
.
0
0
0
OPT
LAT
PGM
0
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