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AT89C51ED2-RDTUM 数据表(PDF) 90 Page - ATMEL Corporation |
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AT89C51ED2-RDTUM 数据表(HTML) 90 Page - ATMEL Corporation |
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90 / 137 page  90 4235K–8051–05/08 AT89C51RD2/ED2 Figure 23-1. Recommended EEPROM Data Write Sequence 23.2 Read Data The following procedure is used to read the data stored in 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 read • Set bit EEE of EECON register • Execute a MOVX A, @DPTR • Clear bit EEE of EECON register • Restore interrupts. EEPROM Data Write Sequence Data Write DPTR= Address ACC= Data Exec: MOVX @DPTR, A Last Byte to Load? EEPROM Mapping EECON = 00h (EEE=0) Save & Disable IT EA= 0 Restore IT EEPROM Data Mapping EECON = 02h (EEE=1) EEBusy Cleared? |
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