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參數(shù)資料
| 型號(hào)： | S80C32-44:RD |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 44 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁(yè)數(shù)： | 63/152頁(yè) |
| 文件大?。?/td> | 2528K |
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19
ATmega8535(L)
2502K–AVR–10/06
The EEPROM Address
Register – EEARH and EEARL
Bits 15..9 – Res: Reserved Bits
These bits are reserved bits in the ATmega8535 and will always read as zero.
Bits 8..0 – EEAR8..0: EEPROM Address
The EEPROM Address Registers – EEARH and EEARL specify the EEPROM address
in the 512 bytes EEPROM space. The EEPROM data bytes are addressed linearly
between 0 and 511. The initial value of EEAR is undefined. A proper value must be writ-
ten before the EEPROM may be accessed.
The EEPROM Data Register –
EEDR
Bits 7..0 – EEDR7..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 oper-
ation, the EEDR contains the data read out from the EEPROM at the address given by
EEAR.
The EEPROM Control Register
– EECR
Bits 7..4 – Res: Reserved Bits
These bits are reserved bits in the ATmega8535 and will always read as zero.
Bit 3 – EERIE: EEPROM Ready Interrupt Enable
Writing EERIE to one enables the EEPROM Ready Interrupt if the I-bit in SREG is set.
Writing EERIE to zero disables the interrupt. The EEPROM Ready interrupt generates a
constant interrupt when EEWE is cleared.
Bit 2 – EEMWE: EEPROM Master Write Enable
The EEMWE bit determines whether setting EEWE to one causes the EEPROM to be
written. When EEMWE is set, setting EEWE within four clock cycles will write data to the
EEPROM at the selected address If EEMWE is zero, setting EEWE will have no effect.
When EEMWE has been written to one by software, hardware clears the bit to zero after
four clock cycles. See the description of the EEWE bit for an EEPROM write procedure.
Bit 1 – EEWE: EEPROM Write Enable
The EEPROM Write Enable Signal EEWE is the write strobe to the EEPROM. When
address and data are correctly set up, the EEWE bit must be written to one to write the
Bit
151413121110
9
8
––––
–––
EEAR8
EEARH
EEAR7
EEAR6
EEAR5
EEAR4
EEAR3
EEAR2
EEAR1
EEAR0
EEARL
7654
321
0
Read/Write
R
RRRR
RR
R/W
Initial Value
0000
000
X
XX
XXX
Bit
7654
321
0
MSB
LSB
EEDR
Read/Write
R/W
Initial Value
0000
000
0
Bit
7654
3
2
1
0
––––
EERIE
EEMWE
EEWE
EERE
EECR
Read/Write
R
R/W
Initial Value
0000
0
X
0
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