參數(shù)資料
型號: MC68HC05BS8FB
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.2 MHz, MICROCONTROLLER, PQFP44
封裝: QFP-44
文件頁數(shù): 51/128頁
文件大?。?/td> 752K
代理商: MC68HC05BS8FB
MC68HC05BS8
MOTOROLA
4-3
MEMORY AND REGISTERS
4
EEPGM - EEPROM Programming Power Enable
1 (set)
Programming power switched on to EEPROM array. If EELAT
≠1 then
EEPGM cannot be set.
0 (clear) –
Programming power switched off to EEPROM array.
4.5.2
EEPROM Options Register
EEPRT - EEPROM Protect
1 (set)
Block 2 ($300-$3FF) congured for read/write.
0 (clear) –
Block 2 ($300-$3FF) congured for read only.
When this bit is erased to “1”, writing to block 2 is not possible until the next external or power-on
reset occurs.
LVR - Low Voltage Reset
1 (set)
Low voltage reset function is disabled.
0 (clear) –
Low voltage reset function is enabled.
This bit does not control any EEPROM operation, but enables/disables the LVR function. When
enabled, and the MCU will reset if VDD drops below VLVR. When this bit is changed, its new value
will have no effect until next external power-on reset.
4.5.3
Read Procedure
To read data from EEPROM, the EELAT bit must be cleared. EEPGM, EER1, and EER0 bits will
be forced to zero. EEPROM is read as if it were normal ROM. The VPP charge pump generator is
off since EEPGM is zero. If a read is performed while ELAT is set, data will be read as $FF.
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
EEOPR
$0200
EEPRT
LVR
unaffected
TPG
27
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