參數(shù)資料
型號： MC80C52CXXX-20/883D
廠商： TEMIC SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CDIP40
文件頁數(shù)： 15/60頁
文件大?。?/td> 5137K
代理商： MC80C52CXXX-20/883D
22
8266D-MCU Wireless-06/12
ATmega128RFA1
call EEPROM_write
…
C Code Example (Single Byte Programming)
void EEPROM_write(unsigned int uiAddress, unsigned char ucData)
{
/* Wait for completion of previous erase/write */
while(EECR & (1<<EEPE))
;
/* Set up address */
EEAR = uiAddress;
EEDR = 255;
/* Write logical one to EEMPE and enable erase only*/
EECR = (1<<EEMPE) + (1<<EEPM0);
/* Start eeprom erase by setting EEPE */
EECR |= (1<<EEPE);
/* Wait for completion of erase */
while(EECR & (1<<EEPE))
;
/* Set up Data Registers */
EEDR = ucData;
/* Write logical one to EEMPE and enable write only */
EECR = (1<<EEMPE) + (2<<EEPM0);
/* Start eeprom write by setting EEPE */
EECR |= (1<<EEPE);
}
Although the code for separate erase/write operations is more complex it is
recommended over the atomic operation. The erase operation can be omitted if the
target EEPROM byte already contains the value 255 (e.g. after a chip erase without the
EESAVE fuse set).
Assembly Code Example (Atomic Operation)
EEPROM_atomic_write:
; Wait for completion of previous write
sbic EECR,EEPE
rjmp EEPROM_atomic_write
; Set up address (r18:r17) in address register
out EEARH, r18
out EEARL, r17
; Write data (r16) to Data Register
out EEDR,r16
; Write logical one to EEMPE
sbi EECR,EEMPE
; Start eeprom write by setting EEPE
sbi EECR,EEPE
ret
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