PIC16LF1902-I/P View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16LF1902-I/P

28-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP Technology

Microchip Technology 

PIC16LF1902/3

FIGURE 10-1:

FLASH PROGRAM MEMORY READ CYCLE EXECUTION

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

Flash ADDR

PC

PC + 1

PMADRH,PMADRL

PPCC++33

PC + 4

PC + 5

Flash Data

INSTR (PC)

INSTR (PC + 1) PMDATH,PMDATL INSTR (PC + 3) INSTR (PC + 4)

RD bit

INSTR(PC - 1)

executed here

BSF PMCON1,RD

executed here

INSTR(PC + 1)

instruction ignored

Forced NOP

executed here

INSTR(PC + 2)

instruction ignored

Forced NOP

executed here

INSTR(PC + 3)

executed here

INSTR(PC + 4)

executed here

PMDATH

PMDATL

Register

EXAMPLE 10-1: FLASH PROGRAM MEMORY READ

* This code block will read 1 word of program

* memory at the memory address:

PROG_ADDR_HI : PROG_ADDR_LO

* data will be returned in the variables;

* PROG_DATA_HI, PROG_DATA_LO

BANKSEL

MOVLW

MOVWF

MOVLW

MOVWL

PMADRL

PROG_ADDR_LO

PMADRL

PROG_ADDR_HI

PMADRH

; Select Bank for PMCON registers

;

; Store LSB of address

;

; Store MSB of address

BCF

PMCON1,CFGS

; Do not select Configuration Space

BCF

INTCON,GIE

; Disable interrupts

BSF

PMCON1,RD

; Initiate read

NOP

; Ignored (Figure 10-1)

NOP

; Ignored (Figure 10-1)

BSF

INTCON,GIE

; Restore interrupts

MOVF

MOVWF

MOVF

MOVWF

PMDATL,W

PROG_DATA_LO

PMDATH,W

PROG_DATA_HI

; Get LSB of word

; Store in user location

; Get MSB of word

; Store in user location

DS41455A-page 80

Preliminary

 2011 Microchip Technology Inc.

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