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PIC16F 데이터시트(PDF) 30 Page - Microchip Technology

부품명 PIC16F
상세설명  PIC16F/LF182X/PIC12F/LF1822 Memory Programming Specification
PDF  40 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F 데이터시트(HTML) 30 Page - Microchip Technology

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PIC16F/LF182X/PIC12F/LF1822
DS41390C-page 30
Advance Information
 2010 Microchip Technology Inc.
7.4
Checksum Computation
The checksum is calculated by two different methods
dependent on the setting of the CP Configuration bit.
7.4.1
PROGRAM CODE PROTECTION
DISABLED
With the program code protection disabled, the
checksum is computed by reading the contents of the
PIC16F/LF182X and PIC12F/LF1822 program memory
locations and adding up the program memory data
starting at address 0000h, up to the maximum user
addressable location. Any Carry bit exceeding 16 bits
are ignored. Additionally, the relevant bits of the
Configuration Words are added to the checksum. All
unimplemented Configuration bits are masked to ‘0’.
EXAMPLE 7-1:
CHECKSUM COMPUTED WITH PROGRAM CODE PROTECTION DISABLED
PIC16F1827, BLANK DEVICE
EXAMPLE 7-2:
CHECKSUM COMPUTED WITH PROGRAM CODE PROTECTION DISABLED
PIC16LF1827, 00AAh AT FIRST AND LAST ADDRESS
TABLE 7-1:
CONFIGURATION WORD
MASK VALUES
Device
Config. Word 1
Mask
Config. Word 2
Mask
PIC16F1826
3FFFh
3713h
PIC16F1827
3FFFh
3713h
PIC16LF1826
3FFFh
3703h
PIC16LF1827
3FFFh
3703h
PIC12F1822
3FFFh
3713h
PIC12LF1822
3FFFh
3713h
PIC16F1823
3FFFh
3713h
PIC16LF1823
3FFFh
3713h
PIC16F1824
3FFFh
3713h
PIC16LF1824
3FFFh
3713h
PIC16F1825
3FFFh
3713h
PIC16LF1825
3FFFh
3713h
PIC16F1828
3FFFh
3713h
PIC16LF1828
3FFFh
3713h
PIC16F1829
3FFFh
3713h
PIC16LF1829
3FFFh
3713h
Note:
Data memory does not effect the
checksum.
PIC16F1827
Sum of Memory addresses 0000h-0FFFh
F000h
Configuration Word 1
3FFFh
Configuration Word 1 mask
3FFFh
Configuration Word 2
3FFFh
Configuration Word 2 mask
3713h
Checksum
= F000h + (3FFFh and 3FFFh) + (3FFFh and 3713h)
= F000h + 3FFFh + 3713h
= 6712h
PIC16LF1827 Sum of Memory addresses 0000h-0FFFh
7156h
Configuration Word 1
3FFFh
Configuration Word 1 mask
3FFFh
Configuration Word 2
3FFFh
Configuration Word 2 mask
3703h
Checksum = 7156h + (3FFFh and 3FFFh) + (3FFFh and 3703h)
= 7156h + 3FFFh + 3703h
= E858h



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