PIC16 datasheet(95/418 Pages) MICROCHIP

95 / 418 page

 2011-2013 Microchip Technology Inc.

DS40001609C-page 95

PIC16(L)F1508/9

FIGURE 10-2:

FLASH PROGRAM MEMORY READ CYCLE EXECUTION

EXAMPLE 10-1:

FLASH PROGRAM MEMORY READ

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

BSF PMCON1,RD

executed here

INSTR(PC + 1)

executed here

PC + 1

PMADRH,PMADRL

PC+3

PC + 5

Flash ADDR

RD bit

PMDATH,PMDATL

PC + 3

PC + 4

INSTR (PC + 1)

INSTR(PC - 1)

executed here

INSTR(PC + 3)

executed here

INSTR(PC + 4)

executed here

Flash Data

PMDATH

PMDATL

INSTR (PC)

INSTR (PC + 3)

INSTR (PC + 4)

instruction ignored

Forced NOP

INSTR(PC + 2)

executed here

instruction ignored

Forced NOP

* This code block will read 1 word of program

* memory at the memory address:

PROG_ADDR_HI : PROG_ADDR_LO

data will be returned in the variables;

PROG_DATA_HI, PROG_DATA_LO

BANKSEL

PMADRL

; Select Bank for PMCON registers

MOVLW

PROG_ADDR_LO

;

MOVWF

PMADRL

; Store LSB of address

MOVLW

PROG_ADDR_HI

;

MOVWF

PMADRH

; Store MSB of address

BCF

PMCON1,CFGS

; Do not select Configuration Space

BSF

PMCON1,RD

; Initiate read

NOP

; Ignored (Figure 10-2)

NOP

; Ignored (Figure 10-2)

MOVF

PMDATL,W

; Get LSB of word

MOVWF

PROG_DATA_LO

; Store in user location

MOVF

PMDATH,W

; Get MSB of word

MOVWF

PROG_DATA_HI

; Store in user location

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