Microcontroller (PIC16F877A) : If program will not reach that point write “unknown”. A = 0000 0000 B = 0011 0011 C = 1011 1010 D = unknown ............................................................................. Why D = unknown ? I need explanation. Thank you.

Fundamentals of Information Systems
8th Edition
ISBN:9781305082168
Author:Ralph Stair, George Reynolds
Publisher:Ralph Stair, George Reynolds
Chapter6: Information And Decision Support Systems
Section: Chapter Questions
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Microcontroller (PIC16F877A) :

If program will not reach that point write “unknown”.

A = 0000 0000

B = 0011 0011

C = 1011 1010

D = unknown

.............................................................................

Why D = unknown ? I need explanation.

Thank you.

PORTB
...
CLRF PORTB
A
MOVLW h'33'
MOVWE PORTB
В
HASAN
BTFSC PORTB,3
GOTO ENGINEER
MOVLW h'BA'
MOVWE PORTB
ENGINEER
MOVLW h'87'
MOVWE PORTB
D
END
Transcribed Image Text:PORTB ... CLRF PORTB A MOVLW h'33' MOVWE PORTB В HASAN BTFSC PORTB,3 GOTO ENGINEER MOVLW h'BA' MOVWE PORTB ENGINEER MOVLW h'87' MOVWE PORTB D END
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