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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189
INC R0 ; point next location
DJNZ R7, LOOP ; continue for all entries
RET ; over
; Name: HEXBCD
; Function: Calculates BCD equivalent of any HEX number less than 64H (100d)
; Input: accumulator contains the HEX number
; Output: accumulator contains converted BCD number
; Calls: none
; Uses: f lags, A, B
HEXBCD: MOV B, #0AH ; load B by 10d
DIV AB ; quotient in the accumulator and reminder in B
SWAP A ; place MS BCD digit in its place
ORL A, B ; merge with LS BCD digit
RET
13.5 | Update Clock Display
Example 13.5
Purpose: Application of DA A instruction for a real-time clock (RTC).
Problem
Develop a subroutine ...
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