參數(shù)資料
型號(hào)： ST7FLIT19B
廠商： 意法半導(dǎo)體
英文描述： 8-Bit MCU With Single Voltage Flash Memory, Data EEPROM, ADC, 5 Timers, SPI(內(nèi)部RC,PLL,ADC,ROP,ICP, IAP,SPI的8位MCU)
中文描述： 8位微控制器單電壓閃存存儲(chǔ)器，數(shù)據(jù)EEPROM，模數(shù)轉(zhuǎn)換器，5計(jì)時(shí)器和SPI（內(nèi)部鋼筋，鎖相環(huán)，藝發(fā)局，人事，電感，國(guó)際檢察官聯(lián)合會(huì)的SPI的8位微控制器）
文件頁數(shù)： 14/155頁
文件大?。?/td> 2968K
代理商： ST7FLIT19B
ST7LITE1xB
14/155
1
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
Readout protection, when selected provides a pro-
tection against program memory content extrac-
tion 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.
Both program and data E
2
memory are protected.
In flash devices, this protection is removed by re-
programming the option. In this case, both pro-
gram and data E
2
memory are 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.
4.5.2 Flash Write/Erase Protection
Write/erase protection, when set, makes it impos-
sible to both overwrite and erase program memo-
ry. It does not apply to E
2
data. Its purpose is to
provide advanced security to applications and pre-
vent any change being made to the memory con-
tent.
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.
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
.
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
0
OPT
LAT
PGM
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