PIC16F87X Datasheet

IC型号：
PIC16F87X
PDF描述：
28/40-pin 8-Bit CMOS FLASH Microcontrollers
文件大小：
1377.31KB
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PIC16F87X

4.6

Writing to the FLASH Program

Memory

trol 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 鈥淏SF

EECON, WR鈥?/div>

should be

NOP

instructions.

After the write cycle, the microcontroller will resume

operation with the 3rd instruction after the EECON1

write instruction.

A word of the FLASH program memory may only be

written to if the word is in a non-code protected seg-

ment 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 con-

EXAMPLE 4-4:

FLASH PROGRAM WRITE

BSF

BCF

MOVLW

MOVWF

MOVLW

MOVWF

MOVLW

MOVWF

MOVLW

MOVWF

BSF

STATUS, RP1

STATUS, RP0

ADDRH

EEADRH

ADDRL

EEADR

DATAH

EEDATH

DATAL

EEDATA

STATUS, RP0

EECON1, EEPGD

EECON1, WREN

;

; Bank 2

;

; MSByte of Program Address to read

;

; LSByte of Program Address to read

;

; MS Program Memory Value to write

;

; LS Program Memory Value to write

; Bank 3

; Point to PROGRAM memory

; Enable writes

BCF

MOVLW

Required

Sequence

MOVWF

MOVLW

MOVWF

BSF

INTCON, GIE

55h

EECON2

AAh

EECON2

EECON1, WR

; Disable Interrupts

;

; Write 55h

;

; Write AAh

; Set WR bit to begin write

NOP

; Instructions here are ignored by the microcontroller

; Microcontroller will halt operation and wait for

; a write complete. After the write

; the microcontroller continues with 3rd instruction

BSF

BCF

INTCON,

GIE

; Enable Interrupts

; Disable writes

EECON1, WREN

4.7

Write Verify

Depending on the application, good programming prac-

tice may dictate that the value written to the memory

should be verified against the original value. This

should be used in applications where excessive writes

can stress bits near the specification limit.

Generally a write failure will be a bit which was written

as a '1', but reads back as a '0' (due to leakage off the

bit).

漏

1999 Microchip Technology Inc.

DS30292B-page 45

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