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參數(shù)資料
| 型號(hào)： | 16F872 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | CAT 5E CROSSOVER PATCH CORD CABLE GREEN 10 FT |
| 中文描述： | 28引腳，8位閃存微控制器的CMOS |
| 文件頁(yè)數(shù)： | 33/160頁(yè) |
| 文件大小： | 2600K |
| 代理商： | 16F872 |
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1999 Microchip Technology Inc.
Preliminary
DS30221A-page 33
PIC16F872
4.6
Writing to the FLASH Program
Memory
When the PIC16F872 is fully code protected or not
code protected, a word of the FLASH program memory
may be written provided the WRT configuration bit is
set. If the PIC16F872 is partially code protected, then a
word of FLASH program memory may be written if the
word is in a non-code protected segment of memory
and the WRT configuration bit is set. To write a FLASH
program location, the first two bytes of the address
must be written to the EEADR and EEADRH registers
and two bytes of the data to the EEDATA and EEDATH
registers, set the EEPGD control bit (EECON1<7>),
and then set control bit WR (EECON1<1>). The
sequence in Example 4-4 must be followed to initiate a
write to program memory.
The microcontroller will then halt internal operations
during the next two instruction cycles for the T
PEW
(parameter D133) in which the write takes place. This
is not SLEEP mode, as the clocks and peripherals will
continue to run. Therefore, the two instructions follow-
ing the “
BSF EECON, WR
” should be
NOP
instructions.
After the write cycle, the microcontroller will resume
operation with the 3rd instruction after the EECON1
write instruction.
EXAMPLE 4-4:
FLASH PROGRAM WRITE
BSF STATUS, RP1 ;
BCF STATUS, RP0 ; Bank 2
MOVLW ADDRH ;
MOVWF EEADRH ; MSByte of Program Address to read
MOVLW ADDRL ;
MOVWF EEADR ; LSByte of Program Address to read
MOVLW DATAH ;
MOVWF EEDATH ; MS Program Memory Value to write
MOVLW DATAL ;
MOVWF EEDATA ; LS Program Memory Value to write
BSF STATUS, RP0 ; Bank 3
BSF EECON1, EEPGD ; Point to PROGRAM memory
BSF EECON1, WREN ; Enable writes
BCF INTCON, GIE ; Disable Interrupts
MOVLW 55h ;
Required
MOVWF EECON2 ; Write 55h
Sequence
MOVLW AAh ;
MOVWF EECON2 ; Write AAh
BSF EECON1, WR ; Set WR bit to begin write
NOP ; Instructions here are ignored by the microcontroller
NOP
; Microcontroller will halt operation and wait for
; a write complete. After the write
; the microcontroller continues with 3rd instruction
BSF INTCON, GIE ; Enable Interrupts
BCF EECON1, WREN ; Disable writes
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