Datasheet

PIC16(L)F1516/7/8/9
DS41452C-page 102  2010-2012 Microchip Technology Inc.
11.4 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 11-2.
When read access is initiated on an address outside
the parameters listed in Ta b l e 11 - 2, the
PMDATH:PMDATL register pair is cleared, reading
back ‘0’s.
TABLE 11-2: USER ID, DEVICE ID AND CONFIGURATION WORD ACCESS (CFGS = 1)
EXAMPLE 11-4: CONFIGURATION WORD AND DEVICE ID ACCESS
Address Function Read Access Write Access
8000h-8003h User IDs Yes Yes
8006h Device ID/Revision ID Yes No
8007h-8008h Configuration Words 1 and 2 Yes No
* 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 11-2)
NOP ; Ignored (See Figure 11-2)
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