參數(shù)資料
型號: AT89C51RD2-SLRUM
廠商: Atmel
文件頁數(shù): 126/137頁
文件大?。?/td> 0K
描述: IC MCU FLASH 8051 EEP 64K 44PLCC
產品培訓模塊: MCU Product Line Introduction
標準包裝: 1
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 60MHz
連通性: SPI,UART/USART
外圍設備: POR,PWM,WDT
輸入/輸出數(shù): 34
程序存儲器容量: 64KB(64K x 8)
程序存儲器類型: 閃存
RAM 容量: 2K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-LCC(J 形引線)
包裝: 標準包裝
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
AT89STK-11-ND - KIT STARTER FOR AT89C51RX2
其它名稱: AT89C51RD2-SLRUMDKR
89
4235K–8051–05/08
AT89C51RD2/ED2
23. EEPROM Data Memory
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.
23.1
Write Data
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:
Check EEBUSY flag
If the user application interrupts routines use XRAM memory space: Save and disable
interrupts.
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
and that the EEPROM segment is not available for reading or writing.
The end of programming is indicated by a hardware clear of the EEBUSY flag.
Figure 23-1 represents the optimal write sequence to the on-chip EEPROM data memory.
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