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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401
27.9 | SOLVED EXAMPLES
ORG 0000
; initialize 8255
START: MOV DPTR, #0003H ; load DPTR by addr of CWR of 8255
MOV A, #89H ; port A and B output, port C input, all mode 0
MOVX @DPTR, A ; send comman word in CWR of 8255
; turn off all LEDs
MOV A, #0FFH
MOV DPTR, #0000H ; address of port A of 8255
MOVX @DPTR, A ; turn off red LEDS
INC DPTR ; address of port B of 8255
MOVX @DPTR, A ; turn off green LEDs
; look for key pressing
ANYKEY: MOV DPTR, #0002H ; address of port C of 8255
KLOOP: MOVX A, @DPTR ; read port C
CPL A ; complement reading
JZ KLOOP ; no key pressed. Keep looking for it.
; some key pressed
CPL A ; get original key status
MOV DPTR, #0001H ...
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