PIC12F617T-I/MS View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC12F617T-I/MS

8-Pin Flash-Based, 8-Bit CMOS Microcontrollers

Microchip Technology 

PIC12F609/615/617/12HV609/615

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

MOVLW MS_PROG_PM_ADDR

MOVWF PMADRH

MOVLW LS_PROG_PM_ADDR

MOVWF PMADRL

BANKSEL PMCON1

BSF

PMCON1, RD

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

;

; MS Byte of Program Address to read

;

; LS Byte of Program Address to read

; Bank to containing PMCON1

; PM Read

NOP

; First instruction after BSF PMCON1,RD executes normally

NOP

BANKSEL PMDATL

MOVF PMDATL, W

MOVF PMDATH, W

; Any instructions here are ignored as program

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

;

; Bank to containing PMADRL

; W = LS Byte of Program PMDATL

; W = MS Byte of Program PMDATL

DS41302D-page 30

 2010 Microchip Technology Inc.

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