PIC12F615-ISLASHMS datasheet(30/212 Pages) MICROCHIP

30 / 212 page

PIC12F609/615/617/12HV609/615

DS41302D-page 30

 2010 Microchip Technology Inc.

3.3

Reading the Flash Program

Memory

To read a program memory location, the user must

write two bytes of the address to the PMADRL and

PMADRH registers, and then set control bit RD

(PMCON1<0>). Once the read control bit is set, the

program memory Flash controller will use the second

instruction cycle after to read the data. This causes the

second instruction immediately following the “BSF

PMCON1,RD

” instruction to be ignored. The data is

available in the very next cycle in the PMDATL and

PMDATH registers; it can be read as two bytes in the

following instructions. PMDATL and PMDATH regis-

ters will hold this value until another read or until it is

written to by the user (during a write operation).

EXAMPLE 3-1:

FLASH PROGRAM READ

BANKSEL PM_ADR

; Change STATUS bits RP1:0 to select bank with PMADRL

MOVLW

MS_PROG_PM_ADDR

;

MOVWF

PMADRH

; MS Byte of Program Address to read

MOVLW

LS_PROG_PM_ADDR

;

MOVWF

PMADRL

; LS Byte of Program Address to read

BANKSEL PMCON1

; Bank to containing PMCON1

BSF

PMCON1, RD

; PM Read

NOP

; First instruction after BSF PMCON1,RD executes normally

NOP

; Any instructions here are ignored as program

; memory is read in second cycle after BSF PMCON1,RD

;

BANKSEL PMDATL

; Bank to containing PMADRL

MOVF

PMDATL, W

; W = LS Byte of Program PMDATL

MOVF

PMDATH, W

; W = MS Byte of Program PMDATL

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