PIC16F1507-ESLASHSS. datasheet(90/278 Pages) MICROCHIP

90 / 278 page

PIC16(L)F1507

DS40001586D-page 90

 2011-2015 Microchip Technology Inc.

10.4

User ID, Device ID and

Configuration Word Access

Instead of accessing program memory, the User ID’s,

Device ID/Revision ID and Configuration Words can be

accessed when CFGS = 1 in the PMCON1 register.

This is the region that would be pointed to by

PC<15> = 1, but not all addresses are accessible.

Different access may exist for reads and writes. Refer

to Table 10-2.

When read access is initiated on an address outside

the

parameters

listed

Table 10-2,

the

PMDATH:PMDATL register pair is cleared, reading

back ‘0’s.

TABLE 10-2:

USER ID, DEVICE ID AND CONFIGURATION WORD ACCESS (CFGS = 1)

EXAMPLE 10-4:

CONFIGURATION WORD AND DEVICE ID ACCESS

Address

Function

Read Access

Write Access

8000h-8003h

User IDs

Yes

8006h

Device ID/Revision ID

Yes

8007h-8008h

Configuration Words 1 and 2

Yes

* This code block will read 1 word of program memory at the memory address:

PROG_ADDR_LO (must be 00h-08h) data will be returned in the variables;

PROG_DATA_HI, PROG_DATA_LO

BANKSEL

PMADRL

; Select correct Bank

MOVLW

PROG_ADDR_LO

;

MOVWF

PMADRL

; Store LSB of address

CLRF

PMADRH

; Clear MSB of address

BSF

PMCON1,CFGS

; Select Configuration Space

BCF

INTCON,GIE

; Disable interrupts

BSF

PMCON1,RD

; Initiate read

NOP

; Executed (See Figure 10-2)

NOP

; Ignored (See Figure 10-2)

BSF

INTCON,GIE

; Restore interrupts

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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