PIC18F4431-I/P Microchip Technology Inc., PIC18F4431-I/P Datasheet - Page 85

• Manufacturer Part Number: PIC18F4431-I/P
• Description: Microcontroller; 16 KB Flash; 768 RAM; 256 EEPROM; 36 I/O; 40-Pin-PDIP
• Manufacturer: Microchip Technology Inc.

Specifications of PIC18F4431-I/P

• A/d Inputs: 9-Channel, 10-Bit
• Cpu Speed: 10 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 36
• Interface: I2C/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 40-pin PDIP
• Programmable Memory: 16K Bytes
• Ram Size: 768 Bytes
• Speed: 40 MHz
• Timers: 1-8-bit, 3-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

EXAMPLE 6-3:
6.5.2
Depending on the application, good programming
practice may dictate that the value written to the
memory should be verified against the original value.
This should be used in applications where excessive
writes can stress bits near the specification limit.
6.5.3
If a write is terminated by an unplanned event, such as
loss of power or an unexpected Reset, the memory
location just programmed should be verified and repro-
grammed if needed. The WRERR bit is set when a
write operation is interrupted by a MCLR Reset, or a
WDT Time-out Reset during normal operation. In these
situations, users can check the WRERR bit and rewrite
the location.
TABLE 6-2:
 2003 Microchip Technology Inc.
TBLPTRU
TBPLTRH
TBLPTRL
TABLAT
INTCON
EECON2
EECON1
IPR2
PIR2
PIE2
Legend:
PROGRAM_MEMORY
Name
x = unknown, u = unchanged, r = reserved, - = unimplemented, read as ‘0’.
Shaded cells are not used during Flash/EEPROM access.
WRITE VERIFY
UNEXPECTED TERMINATION OF
WRITE OPERATION
Program Memory Table Pointer High Byte (TBLPTR<15:8>)
Program Memory Table Pointer High Byte (TBLPTR<7:0>)
Program Memory Table Latch
EEPROM Control Register2 (not a physical register)
GIE/GIEH PEIE/GIEL TMR0IE
EEPGD
OSFIP
OSFIE
OSFIF
Bit 7
BCF
MOVLW
MOVWF
MOVLW
MOVWF
BSF
NOP
BSF
DECFSZ COUNTER_HI
GOTO PROGRAM_LOOP
BCF
—
REGISTERS ASSOCIATED WITH PROGRAM FLASH MEMORY
WRITING TO FLASH PROGRAM MEMORY (CONTINUED)
INTCON,GIE
55h
EECON2
AAh
EECON2
EECON1,WR
INTCON, GIE
EECON1, WREN
CFGS
Bit 6
—
—
—
—
Bit 5
bit21
—
—
—
—
Program Memory Table Pointer Upper Byte
(TBLPTR<20:16>)
INT0IE
FREE
Bit 4
EEIP
EEIF
EEIE
PIC18F2331/2431/4331/4431
Preliminary
; disable interrupts
; required sequence
; write 55H
; write AAH
; start program (CPU stall)
; re-enable interrupts
; loop until done
; disable write to memory
WRERR
RBIE
Bit 3
—
—
—
TMR0IF
6.6
See Section 22.5 “Program Verification and Code
Protection” for details on code protection of Flash pro-
gram memory.
WREN
LVDIP
LVDIE
LVDIF
Bit 2
Flash Program Operation During
Code Protection
INTF
Bit 1
WR
—
—
—
CCP2IP
CCP2IE
CCP2IF
RBIF
Bit 0
RD
--00 0000 --00 0000
0000 0000 0000 0000
0000 0000 0000 0000
0000 0000 0000 0000
0000 000x 0000 000u
xx-0 x000 uu-0 u000
1--1 -1-1 1--1 -1-1
0--0 -0-0 0--0 -0-0
0--0 -0-0 0--0 -0-0
POR, BOR
Value on:
—
DS39616B-page 83
Value on
all other
Resets
—