PIC16F887-E/P Microchip Technology Inc., PIC16F887-E/P Datasheet - Page 121

• Manufacturer Part Number: PIC16F887-E/P
• Description: 40 PIN, 14KB FLASH, 368 RAM, 36 I/O, PDIP
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F887-E/P

• A/d Inputs: 14-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 5 MIPS
• Eeprom Memory: 256 Bytes
• Frequency: 20 MHz
• Input Output: 35
• Interface: I2C/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 40-pin PDIP
• Programmable Memory: 14K Bytes
• Ram Size: 368 Bytes
• Resistance, Drain To Source On: Bytes
• Serial Interface: MSSP or EUSART
• Speed: 20 MHz
• Timers: 2-8-bit, 1-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

An example of the complete eight-word write sequence
is shown in Example 10-4. The initial address is loaded
into the EEADRH and EEADR register pair; the eight
words of data are loaded using indirect addressing.
EXAMPLE 10-4:
© 2008 Microchip Technology Inc.
LOOP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; This write routine assumes the following:
;
;
;
;
BANKSEL
MOVF
MOVWF
MOVF
MOVWF
MOVF
MOVWF
MOVF
MOVWF
INCF
MOVF
MOVWF
INCF
BANKSEL
BSF
BSF
BCF
BTFSC
GOTO
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;
MOVLW
MOVWF
MOVLW
MOVWF
BSF
NOP
NOP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
BCF
BSF
BANKSEL
MOVF
INCF
ANDLW
SUBLW
BTFSS
GOTO
A valid starting address (the least significant bits = '000')
is loaded in ADDRH:ADDRL
ADDRH, ADDRL and DATADDR are all located in data memory
EEADRH
ADDRH,W
EEADRH
ADDRL,W
EEADR
DATAADDR,W
FSR
INDF,W
EEDATA
FSR,F
INDF,W
EEDATH
FSR,F
EECON1
EECON1,EEPGD ; Point to program memory
EECON1,WREN ; Enable writes
INTCON,GIE
INTCON,GIE
$-2
55h
EECON2
0AAh
EECON2
EECON1,WR
EECON1,WREN ; Disable writes
INTCON,GIE
EEADR
EEADR, W
EEADR,F
0x0F
0x0F
STATUS,Z
LOOP
WRITING TO FLASH PROGRAM MEMORY
; Load initial address
;
;
;
; Load initial data address
;
; Load first data byte into lower
;
; Next byte
; Load second data byte into upper
;
;
; Disable interrupts (if using)
; See AN576
; Start of required write sequence:
; Write 55h
;
; Write 0AAh
; Set WR bit to begin write
; Required to transfer data to the buffer
; registers
; Enable interrupts (comment out if not using interrupts)
; Increment address
; Indicates when sixteen words have been programmed
;
;
;
;
; Exit on a match,
; Continue if more data needs to be written
Required Sequence
0x0F = 16 words
0x0B = 12 words (PIC16F884/883/882 only)
0x07 = 8 words
0x03 = 4 words(PIC16F884/883/882 only)
PIC16F882/883/884/886/887
DS41291E-page 119