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<A HREF=zeeprom.html></A> <A HREF=inst.html></A> <A HREF=ydir.html></A> <A HREF=inde.html></A> <A HREF=zarch.html></A> <A HREF=zioreg.html></A> <A HREF=yexp.html></A> <!-- text used in the movie-->
<!--EEPROM Accessing The AT90S2313 contains 128 bytes of EEPROM data memory. It is organized as a separate data space in which single bytes can be read and written. The EEPROM has an endurance of at least 100,000 write/erase cycles. The EEPROM has three I/O registers: EEPROM Address Register, EEPROM Data Register and EEPROM Control Register. Data Bus 8-bit EEPROM Data Memory Array [EEDR] [EEAR] LSB [EECR] EERE EEWE EEMWE MSB EEAR0 EEAR1 EEAR2 EEAR3 EEAR4 EEAR5 EEAR6 [R16] [R17] [R18] ;***** Program a random location ******************* ldi r16,$AA ;store $aa in r17,$05 ;location $05 EEWrite : sbic EECR, EEWE ;if EEWE not clear rjmp ;wait more out EEAR, r17 ;output address EEDR, r16 ;output data sbi EECR, EEMWE ;set EEPROM EECR, EEWE ;Write strobe ;***** Read from a random locations **************** EERead EECR,EEWE EEAR,r17 EECR,EERE ;set Read strobe in r18,EEDR ;get data $ 00 $ AA ;***** Program a random location ******************* ldi r16,$AA ;store $aa in r17,$05 ;location $05 EEWrite : sbic EECR, EEWE ;if EEWE not clear rjmp ;wait more out EEAR, r17 ;output address EEDR, r16 ;output data sbi EECR, EEMWE ;set EEPROM EECR, EEWE ;Write strobe ;***** Read from a random locations **************** EERead EECR,EEWE EEAR,r17 EECR,EERE ;set Read strobe in r18,EEDR ;get data $ 05 ;***** Program a random location ******************* ldi r16,$AA ;store $aa in r17,$05 ;location $05 EEWrite : sbic EECR, EEWE ;if EEWE not clear rjmp ;wait more out EEAR, r17 ;output address EEDR, r16 ;output data sbi EECR, EEMWE ;set EEPROM EECR, EEWE ;Write strobe ;***** Read from a random locations **************** EERead EECR,EEWE EEAR,r17 EECR,EERE ;set Read strobe in r18,EEDR ;get data ;***** Program a random location ******************* ldi r16,$AA ;store $aa in r17,$05 ;location $05 EEWrite : sbic EECR, EEWE ;if EEWE not clear rjmp ;wait more out EEAR, r17 ;output address EEDR, r16 ;output data sbi EECR, EEMWE ;set EEPROM EECR, EEWE ;Write strobe ;***** Read from a random locations **************** EERead EECR,EEWE EEAR,r17 EECR,EERE ;set Read strobe in r18,EEDR ;get data ;***** Program a random location ******************* ldi r16,$AA ;store $aa in r17,$05 ;location $05 EEWrite : sbic EECR, EEWE ;if EEWE not clear rjmp ;wait more out EEAR, r17 ;output address EEDR, r16 ;output data sbi EECR, EEMWE ;set EEPROM EECR, EEWE ;Write strobe ;***** Read from a random locations **************** EERead EECR,EEWE EEAR,r17 EECR,EERE ;set Read strobe in r18,EEDR ;get data ;***** Program a random location ******************* ldi r16,$AA ;store $aa in r17,$05 ;location $05 EEWrite : sbic EECR, EEWE ;if EEWE not clear rjmp ;wait more out EEAR, r17 ;output address EEDR, r16 ;output data sbi EECR, EEMWE ;set EEPROM sbi ;Write strobe ;***** Read from a random locations **************** EERead EECR,EEWE EEAR,r17 EECR,EERE ;set Read strobe in r18,EEDR ;get data ;***** Program a random location ******************* ldi r16,$AA ;store $aa in r17,$05 ;location $05 EEWrite : sbic EECR, EEWE ;if EEWE not clear rjmp ;wait more out EEAR, r17 ;output address EEDR, r16 ;output data sbi EECR, EEMWE ;set EEPROM ;Write strobe ;***** Read from a random locations **************** EERead EECR,EEWE EEAR,r17 EECR,EERE ;set Read strobe in r18,EEDR ;get data ;***** Program a random location ******************* ldi r16,$AA ;store $aa in r17,$05 ;location $05 EEWrite : sbic EECR, EEWE ;if EEWE not clear rjmp ;wait more out EEAR, r17 ;output address EEDR, r16 ;output data sbi EECR, EEMWE ;set EEPROM ;Write strobe ;***** Read from a random locations **************** EERead EECR,EEWE EEAR,r17 EECR,EERE ;set Read strobe in r18,EEDR ;get data ;***** Program a random location ******************* ldi r16,$AA ;store $aa in r17,$05 ;location $05 EEWrite : sbic EECR, EEWE ;if EEWE not clear rjmp ;wait more out EEAR, r17 ;output address EEDR, r16 ;output data sbi EECR, EEMWE ;set EEPROM ;Write strobe ;***** Read from a random locations **************** EERead EECR,EEWE EEAR,r17 EECR,EERE ;set Read strobe in r18,EEDR ;get data ;***** Program a random location ******************* ldi r16,$AA ;store $aa in r17,$05 ;location $05 EEWrite : sbic EECR, EEWE ;if EEWE not clear rjmp ;wait more out EEAR, r17 ;output address EEDR, r16 ;output data sbi EECR, EEMWE ;set EEPROM ;Write strobe ;***** Read from a random locations **************** EERead EECR,EEWE EEAR,r17 sbi EECR,EERE ;set Read strobe in r18,EEDR ;get data ;***** Program a random location ******************* ldi r16,$AA ;store $aa in r17,$05 ;location $05 EEWrite : sbic EECR, EEWE ;if EEWE not clear rjmp ;wait more out EEAR, r17 ;output address EEDR, r16 ;output data sbi EECR, EEMWE ;set EEPROM ;Write strobe ;***** Read from a random locations **************** EERead EECR,EEWE EEAR,r17 sbi EECR,EERE ;set Read strobe in r18,EEDR ;get data --><OBJECT classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
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