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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT89C51ED2-RDTIM датащи(PDF) 93 Page - ATMEL Corporation |
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AT89C51ED2-RDTIM датащи(HTML) 93 Page - ATMEL Corporation |
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93 / 137 page  93 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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