參數(shù)資料
型號(hào): X24C01A
英文描述: Serial EEPROM(二線接口串行EEPROM)
中文描述: 串行EEPROM(二線接口串行EEPROM的)
文件頁數(shù): 6/6頁
文件大?。?/td> 21K
代理商: X24C01A
Xicor Application Note
AN02
AN02-6
;*******************************************************************
;* ISSUE AN ACKNOWLEDGE.
;*******************************************************************
ACK: and p2,SDALO ; PERFORM AN ACKNOWLEDGE, SDA LOW
call CLOCK ; GENERATE A CLOCK PULSE
ret
;*******************************************************************
;* THE NACK ROUTINE DOES NOT CHECK
;* TO SEE IF THE EEPROM ACTUALLY ISSUES AN ACKNOWLEDGE.
;*******************************************************************
NACK: or p2,SDAHI ; SDA HIGH
call CLOCK ; GENERATE A CLOCK PULSE
ret
;*******************************************************************
;* ISSUE A CLOCK PULSE. WHILE THE CLOCK IS HIGH THE VALUE ON THE
;* SDA LINE IS PLACED IN THE CARRY FLAG. WHEN A READ IS TAKING
;* PLACE THE CARRY FLAG WILL INDICATE THE VALUE FROM THE EEPROM.
;*******************************************************************
CLOCK: nop
nop
or p2,SCLHI ; BRING SCL HIGH
nop
nop
ld TEMP,p2 ; READ SDA
rrc TEMP ; SAVE SDA VALUE IN CARRY
and p2,SCLLO ; SCL LOW
ret
.end
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