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参数资料
| 型号： | MB9AF314NBGL |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 40 MHz, RISC MICROCONTROLLER, PBGA112 |
| 封装： | 0.80 MM PITCH, PLASTIC, FBGA-112 |
| 文件页数： | 28/114页 |
| 文件大小： | 1357K |
| 代理商： | MB9AF314NBGL |
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ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
20
8.6
Register Description
8.6.1
EEARH and EEARL – The EEPROM Address Register
Bits 15:9] – Reserved
These bits are reserved bits in the Atmel ATmega48PA/88PA/168PA and will always read as zero.
Bits 8:0 – EEAR[8:0]: EEPROM Address
The EEPROM address registers – EEARH and EEARL specify the EEPROM address in the 256/512/512/1K bytes
EEPROM space. The EEPROM data bytes are addressed linearly between 0 and 255/511/511/1023. The initial value of
EEAR is undefined. A proper value must be written before the EEPROM may be accessed.
EEAR8 is an unused bit in the Atmel ATmega48PA and must always be written to zero.
8.6.2
EEDR – The EEPROM Data Register
Bits 7:0 – EEDR[7:0]: EEPROM Data
For the EEPROM write operation, the EEDR register contains the data to be written to the EEPROM in the address given by
the EEAR register. For the EEPROM read operation, the EEDR contains the data read out from the EEPROM at the address
given by EEAR.
8.6.3
EECR – The EEPROM Control Register
Bits 7:6 – Reserved
These bits are reserved bits in the Atmel ATmega48PA/88PA/168PA and will always read as zero.
Bits 5, 4 – EEPM1 and EEPM0: EEPROM Programming Mode Bits
The EEPROM programming mode bit setting defines which programming action that will be triggered when writing EEPE. It
is possible to program data in one atomic operation (erase the old value and program the new value) or to split the erase and
write operations in two different operations. The programming times for the different modes are shown in Table 8-1.
While EEPE is set, any write to EEPMn will be ignored. During reset, the EEPMn bits will be reset to 0b00 unless the
EEPROM is busy programming.
Bit
1514
1312
11
10
9
8
––––
–––
EEAR8
EEARH
EEAR7
EEAR6
EEAR5
EEAR4
EEAR3
EEAR2
EEAR1
EEAR0
EEARL
7654
3210
Read/Write
RRRR
RRR
R/W
Initial Value
0000
000
X
XX
XXXXX
X
Bit
765
43210
MSB
LSB
EEDR
Read/Write
R/W
Initial Value
000
00000
Bit
7
654
3
2
1
0
–
EEPM1
EEPM0
EERIE
EEMPE
EEPE
EERE
EECR
Read/Write
R
R/W
Initial Value
0
X
0
X
0
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