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PIC16C770/SS 用户编程技术手册 - Microchip（微芯）
制造商:
Microchip（微芯）
分类:
微控制器
封装:
SSOP-20
描述:
PIC16 系列 256 B RAM 2 K x 14位 EPROM 8位 CMOS 微控制器 - SSOP-20
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PIC16C770/SS数据手册
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若手册格式错乱，请下载阅览PDF原文件
1996 Microchip Technology Inc. DS30154F-page 3
SQTP Specification for PIC16/17
APPENDIX A:
Implementing a table in the program memory of
PIC16C5X and PIC16C5XA:
The PIC16C5X and the PIC16C5XA family uses Har-
vard architecture, in which the program memory is sep-
arate from data memory. All instructions operate on
data that is fetched from the register file or data mem-
ory. Since there are no instructions to read from or write
to the program memory, simply storing data words in
program memory is of no use. There is, however, a sim-
ple and elegant way to implement constant tables in the
program memory by using the
RETLW
instruction. This
instruction returns from a subroutine as well as loads
an 8-bit constant into the W register. The following
example shows how to get a byte of “serial information”
from the table stored at location 000h in PIC16C54:
ORG 0 ;store serial numbers
RETLW 0FFh
RETLW 0FFh
RETLW 0FFh
RETLW 0FFh
RETLW 0FFh
RETLW 0FFh
RETLW 0FFh
RETLW 0FFh ;end of serial
;numbers
•
•
main_prog ORG XYZ ;This is main program
•
•
MOVLW byte_num ;byte_num = 0 for 1st
;byte
CALL get_1byte;
•
•
get_1byte MOVWF PC ;write W to program
;counter
;W = offset = 0 for
;1st byte
;end of get_1byte sub
;routine
•
•
•
END
The next example shows how a serial number may
reside at location other than 000h.
main_prog ORG XYZ ;This is main program
•
•
MOVLW byte_num ;byte_num = 0 for 1st
;byte
CALL get_1byte;
•
•
get_1byte ADDWFPC ;W = offset
RETLW 0ffh ;
RETLW 0ffh ;
RETLW 0ffh ;
RETLW 0ffh ;
RETLW 0ffh ;
RETLW 0ffh ;
RETLW 0ffh ;
RETLW 0ffh ;end of serial
;numbers
•
•
END
APPENDIX B:
Standard hex file format for serial programming:
The hex file containing the ‘serial numbers’ will be in
Intel hex 8-bit format. Since the PIC16C5X and the
PIC16C5XA have 12-bit data words, all addresses are
doubled in this hex format. Each line of the hex file will
be for a new part. Each line can contain only up to 16
bytes (i.e. eight PIC16C5X, PIC16C5XA instruction
words). The format is as follows:
:
NNAAAATTHHHHHH......HHCC
where:
NN = byte count on current line (max 10h allowed)
AAAA = address in four hex digits
TT = record type, always 00 except 01 for EOF
HH = Two digit hex data byte
CC = Two digit hex checksum
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