May 2024
Intermediate to advanced
534 pages
17h 58m
English
book
8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
by Subrata Ghoshal
Content preview from 8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
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190
PROGRAMMING EXAMPLESIII
MOV 30H, A ; update minute count
CJNE A, #60H, GOBAK ; yet to complete an hour
MOV 30H, #00H ; 1 h over, set minute as 00
MOV A, 31H ; get hour count in A
ADD A, #01H ; increment hour by one
DA A ; adjust for BCD increment
MOV 31H, A ; store back hour count
CJNE A, #24H, GOBAK ; no need to reset hour
MOV 31H, #00H ; reset hour count also
GOBAK: RET ; over
13.6 | Display Shift for Right Entry
Example 13.6
Purpose: To highlight the coordination of XCH, XCHD and SWAP instructions.
Problem
A four-digit BCD display to be shifted left by one digit in order to accommodate a f ...
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