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AT89C51ED2-RDTIM 데이터시트(PDF) 93 Page - ATMEL Corporation

부품명 AT89C51ED2-RDTIM
상세설명  8-bit Flash Microcontroller
PDF  137 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ED2-RDTIM 데이터시트(HTML) 93 Page - ATMEL Corporation

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AT89C51RD2/ED2
4235E–8051–04/04
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.
Figure 39. Recommended EEPROM Data Read Sequence
EEPROM Data Read
Sequence
Data Read
DPTR= Address
ACC= Data
Exec: MOVX A, @DPTR
Last Byte
to Read?
EEPROM Data Mapping
EECON = 02h (EEE=1)
EEPROM Data Mapping
EECON = 00h (EEE = 0
Save & Disable IT
EA= 0
Restore IT
EEBusy
Cleared?



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