
PIC18F2XK20/4XK20
DS41297F-page 36
Advance Information
2009 Microchip Technology Inc.
PIC18FX5K20
None
SUM[0000:07FF]+SUM[0800:1FFF]+SUM[2000:3FFF]+
SUM[4000:5FFF]+SUM[6000:7FFF]+(CONFIG1L & 00h)+
(CONFIG1H & CFh)+(CONFIG2L & 1Fh)+(CONFIG2H & 1F)+
(CONFIG3L & 00h)+(CONFIG3H & 8Fh)+(CONFIG4L & C5h)+
(CONFIG4H & 00h)+(CONFIG5L & 0Fh)+(CONFIG5H & C0h)+
(CONFIG6L & 0Fh)+(CONFIG6H & E0h)+(CONFIG7L & 0Fh)+
(CONFIG7H & 40h)
8362h
82B8h
Boot
Block
SUM[0800:1FFF]+SUM[2000:3FFF]+SUM[4000:5FFF]+SUM[6000:7FFF
]+
(CONFIG1L & 00h)+(CONFIG1H & CFh)+(CONFIG2L & 1Fh)+
(CONFIG2H & 1F)+(CONFIG3L & 00h)+(CONFIG3H & 8Fh)+
(CONFIG4L & C5h)+(CONFIG4H & 00h)+(CONFIG5L & 0Fh)+
(CONFIG5H & C0h)+(CONFIG6L & 0Fh)+(CONFIG6H & E0h)+
(CONFIG7L & 0Fh)+(CONFIG7H & 40h)+SUM_ID
8B35h
8AEAh
Boot/
Block 0/
Block 1
SUM[4000:5FFF]+SUM[6000:7FFF]+(CONFIG1L & 00h)+
(CONFIG1H & CFh)+(CONFIG2L & 1Fh)+(CONFIG2H & 1F)+
(CONFIG3L & 00h)+(CONFIG3H & 8Fh)+(CONFIG4L & C5h)+
(CONFIG4H & 00h)+(CONFIG5L & 0Fh)+(CONFIG5H & C0h)+
(CONFIG6L & 0Fh)+(CONFIG6H & E0h)+(CONFIG7L & 0Fh)+
(CONFIG7H & 40h)+SUM_ID
C332h
C2E7h
All
(CONFIG1L & 00h)+(CONFIG1H & CFh)+(CONFIG2L & 1Fh)+
(CONFIG2H & 1F)+(CONFIG3L & 00h)+(CONFIG3H & 8Fh)+
(CONFIG4L & C5h)+(CONFIG4H & 00h)+(CONFIG5L & 0Fh)+
(CONFIG5H & C0h)+(CONFIG6L & 0Fh)+(CONFIG6H & E0h)+
(CONFIG7L & 0Fh)+(CONFIG7H & 40h)+SUM_ID
0326h
0330h
TABLE 5-4:
CHECKSUM COMPUTATION (CONTINUED)
Device
Code-
Protect
Checksum
Blank
Value
0xAA at 0
and Max
Address
Legend:
Item
Description
CONFIGx = Configuration Word
SUM[a:b] = Sum of locations, a to b inclusive
SUM_ID
= Byte-wise sum of lower four bits of all customer ID locations
+= Addition
&
= Bit-wise AND