VTech Alphabert s Magic Readport User Manual download pdf (Page 64)

Lab Manual of Microcontroller & Interfacing Page 64

B. Consider that switch SW1 and SW2 shown in the circuit are two limit switches are

connected at external interrupt pins P3.2 and P3.3. Write a program so that when switch

SW1 is pressed, stepper motor rotates clockwise and when switch SW2 pressed, stepper

motor rotates anticlockwise.

(Hint: Use external interrupt vector location. Prepare clockwise routine and call it at

location 03h. Prepare anticlockwise routine and call it at vector location 13h. Enable

external interrupt bits in IE SFR)

Memory

Location

HEX

code

Label Opcode Operands Comments

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 79 80

No comments

VTech Alphabert s Magic Readport User Manual Page 64