AT89C51ED2-3CSIM Atmel, AT89C51ED2-3CSIM Datasheet - Page 89

• Manufacturer Part Number: AT89C51ED2-3CSIM
• Description: IC 8051 MCU FLASH 64K 40DIP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51ED2-3CSIM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 60MHz
• Connectivity: SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 34
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Data Bus Width: 8 bit
• Data Ram Size: 64 KB
• Interface Type: SPI, UART
• Maximum Clock Frequency: 60 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3 x 16 bit
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -
• Lead Free Status / Rohs Status: No

23. EEPROM Data Memory
23.1
4235K–8051–05/08
Write Data
This feature is available only for the AT89C51ED2 device.
The 2K bytes on-chip EEPROM memory block is located at addresses 0000h to 07FFh of the
XRAM/ERAM memory space and is selected by setting control bits in the EECON register.
A read or write access to the EEPROM memory is done with a MOVX instruction.
Data is written by byte to the EEPROM memory block as for an external RAM memory.
The following procedure is used to write to the EEPROM memory:
Figure 23-1 represents the optimal write sequence to the on-chip EEPROM data memory.
• Check EEBUSY flag
• If the user application interrupts routines use XRAM memory space: Save and disable
• Load DPTR with the address to write
• Store A register with the data to be written
• Set bit EEE of EECON register
• Execute a MOVX @DPTR, A
• Clear bit EEE of EECON register
• Restore interrupts.
• EEBUSY flag in EECON is then set by hardware to indicate that programming is in progress
• The end of programming is indicated by a hardware clear of the EEBUSY flag.
interrupts.
and that the EEPROM segment is not available for reading or writing.
AT89C51RD2/ED2
89