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What is the assembly language program for 8085 interfacing of stepper motor to rotate it clockwise and anticlockwise direction using 8255?
As port A is used as an output port, control word for 8255 is 80H.
Stepper Motor Control Program:
6000H Excite code DB 03H, 06H,09H, OCH : This is the code sequence for clockwise rotation
Subroutine to rotate a stepper motor clockwise by 360° - Set the counts:
- MVI C, 32H : Set repetition count to 50ıο
- START: MVI B, 04H : Counts excitation sequence
- LXI H, 6000H : Initialize pointer
- BACK1: MOV A, M : Get the Excite code
- OUT PORTA : Send Excite code
- CALL DELAY : Wait
- INX H : Increment pointer
- DCR B : Repeat 4 times
- JNZ BACK l
Delay Subroutine:
- Delay: LXI D, Count
- Back: DCX D
- MOV A, D
- ORA E
- JNZ Back
- RET
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What has the author Ambrose Barry written?
Ambrose Barry has written: '68000 Assembly Language, Programming And Interfacing' -- subject(s): Computer interfaces, Motorola 68000 (Microprocessor), Programming
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