AT89C51RD2 Atmel Corporation, AT89C51RD2 Datasheet - Page 91

• Manufacturer Part Number: AT89C51RD2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RD2

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Sram (kbytes): 2
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

23.3
4235K–8051–05/08
Registers
Figure 23-2. Recommended EEPROM Data Read Sequence
Table 23-1.
EECON (0D2h)
EEPROM Control Register
Bit Number
7 - 2
7
-
Mnemonic
EECON Register
6
-
Bit
-
Description
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5
-
Exec: MOVX A, @DPTR
EEPROM Data Mapping
EEPROM Data Mapping
EECON = 00h (EEE = 0
EEPROM Data Read
EECON = 02h (EEE=1)
Save & Disable IT
DPTR= Address
4
-
Sequence
ACC= Data
Last Byte
Cleared?
Data Read
to Read?
Restore IT
EEBusy
EA= 0
3
-
AT89C51RD2/ED2
2
-
EEE
1
EEBUSY
0
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