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标题: 片内flash读写 [打印本页]

作者: lucky 时间: 2012-8-20 15:59
标题: 片内flash读写
在对flash的读写操作时发现那句WR或者rd置1的语句没能执行，eeif标志位没变。不知还有什么要设置的？试过了，读写E2PROM没有问题，能对其置1.期待大侠指点，谢谢

LIST P=16F877,R=DEC
#include <p16F877.inc>
count = 21H
addrl equ  76H
addrh equ  77H
datal equ  78h
datah equ  79h
e_addrl  equ  176H
e_addrh  equ  177H
e_data  equ  178H
e_datah  equ  179H
org 000h
main
movlw  05h
movwf  addrl
movlw  07h
movwf  addrh
movlw  08h
movwf  datal
movlw  08h
movwf  datah

BSF STATUS, RP1 ;
BSF STATUS, RP0 ;Bank 3
BCF STATUS, RP0 ;Bank 2
movf  e_addrl,0
      movwf EEADR    ; 存入数据的E2PROM地址
movf  e_addrh,0
      movwf EEADRH    ; 存入数据的E2PROM地址
movf  e_datah,0
      movwf EEDATH    ; 存入E2PROM的数据
      movf  e_data,0
      movwf EEDATA    ; 存入E2PROM的数据
BSF STATUS, RP0 ;Bank 3
BSF EECON1, EEPGD

oint to Data memory
BSF EECON1, WREN  ;Enable writes
                  ;Only disable interrupts
BCF INTCON, GIE ;if already enabled,
                  ;otherwise discard
MOVLW  0x55       ;Write 55h to
MOVWF  EECON2       ;EECON2
MOVLW  0xAA       ;Write AAh to
MOVWF  EECON2       ;EECON2
BSF EECON1, WR ;Start write operation
                  ;Only enable interrupts
NOP
NOP
BSF INTCON, GIE ;if using interrupts,
                  ;otherwise discard
BCF EECON1, WREN  ;Disable writes
goto $

S
end

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