PIC18F1220ESLASHSOSQTP datasheet(67/308 Pages) MICROCHIP

67 / 308 page

DS39605F-page 65

PIC18F1220/1320

EXAMPLE 6-3:

WRITING TO FLASH PROGRAM MEMORY (CONTINUED)

6.5.2

WRITE VERIFY

Depending on the application, good programming

practice may dictate that the value written to the mem-

ory should be verified against the original value. This

should be used in applications where excessive writes

can stress bits near the specification limit.

6.5.3

UNEXPECTED TERMINATION OF

WRITE OPERATION

If a write is terminated by an unplanned event, such as

loss of power or an unexpected Reset, the memory

location just programmed should be verified and repro-

grammed if needed. The WRERR bit is set when a

write operation is interrupted by a MCLR Reset, or a

WDT Time-out Reset during normal operation. In these

situations, users can check the WRERR bit and rewrite

the location.

6.6

Flash Program Operation During

Code Protection

See Section 19.0 “Special Features of the CPU” for

details on code protection of Flash program memory.

TABLE 6-2:

REGISTERS ASSOCIATED WITH PROGRAM FLASH MEMORY

WRITE_WORD_TO_HREGS

MOVF

POSTINC0, W

; get low byte of buffer data and increment FSR0

MOVWF

TABLAT

; present data to table latch

TBLWT+*

; short write

; to internal TBLWT holding register, increment

TBLPTR

DECFSZ

COUNTER

; loop until buffers are full

GOTO

WRITE_WORD_TO_HREGS

PROGRAM_MEMORY

BCF

INTCON, GIE

; disable interrupts

MOVLW

55h

; required sequence

MOVWF

EECON2

; write 55H

MOVLW

AAh

MOVWF

EECON2

; write AAH

BSF

EECON1, WR

; start program (CPU stall)

NOP

BSF

INTCON, GIE

; re-enable interrupts

DECFSZ

COUNTER_HI

; loop until done

GOTO PROGRAM_LOOP

BCF

EECON1, WREN

; disable write to memory

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on:

POR, BOR

Value on

all other

Resets

TBLPTRU

—

bit 21

Program Memory Table Pointer Upper Byte (TBLPTR<20:16>) --00 0000 --00 0000

TBPLTRH Program Memory Table Pointer High Byte (TBLPTR<15:8>)

0000 0000 0000 0000

TBLPTRL

Program Memory Table Pointer High Byte (TBLPTR<7:0>)

0000 0000 0000 0000

TABLAT

Program Memory Table Latch

0000 0000 0000 0000

INTCON

GIE/GIEH PEIE/GIEL TMR0IE

INTE

RBIE

TMR0IF

INTF

RBIF

0000 000x 0000 000u

EECON2

EEPROM Control Register 2 (not a physical register)

——

EECON1

EEPGD

CFGS

—

FREE

WRERR

WREN

xx-0 x000 uu-0 u000

IPR2

OSCFIP

—

—EEIP

—

LVDIP

TMR3IP

—

1--1 -11- 1--1 -11-

PIR2

OSCFIF

—

—EEIF

—

LVDIF

TMR3IF

—

0--0 -00- 0--0 -00-

PIE2

OSCFIE

—

—EEIE

—

LVDIE

TMR3IE

—

0--0 -00- 0--0 -00-

Legend:

= unknown, u = unchanged, – = unimplemented, read as ‘0’.

Shaded cells are not used during Flash/EEPROM access.

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