AN560 데이터 시트보기 (PDF) - Microchip Technology
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AN560 Datasheet PDF : 22 Pages
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Using the 93LC56 and 93LC66
16c5x/7x Cross-Assembler V4.12 Released Mon Jun 06 10:49:06 1994 Page 1
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LIST P=16C54,c=132
;****************************************************************
;
3-Wire Byte Write Program (106 bytes)
;
;
This program demonstrates how to interface a
;
Microchip PIC16C54 to a 93LC56 or 93LC66 Serial EE
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device. This program will execute the erase/write enable
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command, write to 8 consecutive addresses, and then
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execute the erase/write disable command. This
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sequence will repeat forever.
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After each byte is written, time must be given to the
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device for it to complete the write cycle before
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the next command can be sent. The easiest solution
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is to consult the data book for the maximum write
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cycle time and just wait that long before the next
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command is sent. This program demonstrates that
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solution.
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Another, more efficient method of determining when the
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write cycle is complete is called ‘data polling.’ This
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method is demonstrated in the program “3wdpoll.”
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This program communicates to the serial EE in the
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x16 mode, and ASSUMES THE USER HAS SET THE ORG PIN
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ON THE DEVICE TO Vcc.
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Timing is based on using the PIC16C54 in ‘XT’ mode
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using a 4Mhz crystal. Clock speeds to the serial EE
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will be approximately 40 kHz for this setup.
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PIC16C54 to Serial EE Connections:
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PIC16C54
Serial EE
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——————
——————
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Pin 10 (RB4) —> Chip Select
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Pin 11 (RB5) —> Clock
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Pin 12 (RB6) —> Data In
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Pin 13 (RB7) —> Data Out
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ORG=Vcc
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;************************************************************
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Register Assignments
;************************************************************
port_a equ
5h
; port 5 (port_a)
port_b equ
6h
; port 6 (port b) comm lines to serial EE
eeprom equ 0ah
; bit buffer
addr equ 0ch
; address register
datai equ 0dh
; stored data input reg.
datao equ 0eh
; stored data output reg.
txbuf equ 10h
; transmit buffer
16c5x/7x Cross-Assembler V4.12 Released Mon Jun 06 10:49:06 1994 Page 2
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count equ 11h
; bits transmitted so far
bits equ 12h
; bits to transmit
bytcnt equ 13h
; byte counter for write routine
loops equ 15h
; delay loop counter
loops2 equ 16h
; delay loop counter
;
;************************************************************
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Bit Assignments
;************************************************************
di
equ 7
; eeprom input
DS00560D-page 6
8-104
© 1994 Microchip Technology Inc.
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