PIC16F722-ESLASHML datasheet(189/302 Pages) MICROCHIP

189 / 302 page

DS41341E-page 189

PIC16F72X/PIC16LF72X

18.0

PROGRAM MEMORY READ

The Flash program memory is readable during normal

operation over the full VDD range of the device. To read

data from Program Memory, five Special Function

Registers (SFRs) are used:

•PMCON1

•PMDATL

•PMDATH

• PMADRL

• PMADRH

The value written to the PMADRH:PMADRL register

pair determines which program memory location is

read. The read operation will be initiated by setting the

RD bit of the PMCON1 register. The program memory

flash controller takes two instructions to complete the

read, causing the second instruction after the setting

the RD bit will be ignored. To avoid conflict with pro-

gram execution, it is recommended that the two instruc-

tions following the setting of the RD bit are NOP. When

the read completes, the result is placed in the

PMDATLH:PMDATL

pair.

Refer

Example 18-1 for sample code.

EXAMPLE 18-1:

PROGRAM MEMORY READ

Note:

Code-protect does not effect the CPU

from performing a read operation on the

program memory. For more information,

refer to Section 8.2 “Code Protection”

BANKSEL

PMADRL

;

MOVF

MS_PROG_ADDR, W ;

MOVWF

PMADRH

;MS Byte of Program Address to read

MOVF

LS_PROG_ADDR, W ;

MOVWF

PMADRL

;LS Byte of Program Address to read

BANKSEL

PMCON1

;

BSF

PMCON1, RD

;Initiate Read

NOP

;Any instructions here are ignored as program

;memory is read in second cycle after BSF

BANKSEL

PMDATL

;

MOVF

PMDATL, W

;W = LS Byte of Program Memory Read

MOVWF

LOWPMBYTE

;

MOVF

PMDATH, W

;W = MS Byte of Program Memory Read

MOVWF

HIGHPMBYTE

;

PIC16F722-E/ML Datasheet(PDF) 189 Page - Microchip Technology

PIC16F722-E/ML Datasheet(HTML) 189 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL