Question

2. A stepper motor is connected with the 8086-microprocessor system using the 8255- programmable peripheral interfacing IC. The four phases of the motor are connected to Port-A as shown in figure 2. Two control switches are connected to Port-C. The control on motor should be done as follows: PC1 PCo Motor Operation 0 0 Off 0 1 1-phase Full-step mode 1 0 2-phase Full-step mode 1 1 Half-step mode (a) Find the addresses of the ports and control register, (b) Find the control word, (c) Write an assembly language program to perform the job as mentioned. A15 A14 A13 A11 Ao Vcc PA0 R R IORD RD PA1 Stepper IOWR A2 R Motor WR PA3 Do-D7 8255 PPI A1 Ao A2 A1 CS PCo PC1 R Fig.2: Stepper Motor interfaced with 8255

          2. A stepper motor is connected with the 8086-microprocessor system using the 8255-
programmable peripheral interfacing IC. The four phases of the motor are connected to
Port-A as shown in figure 2. Two control switches are connected to Port-C. The control on
motor should be done as follows:
PC1 PCo
Motor Operation
0
0
Off
0
1
1-phase Full-step mode
1
0
2-phase Full-step mode
1
1
Half-step mode
(a) Find the addresses of the ports and control register,
(b) Find the control word,
(c) Write an assembly language program to perform the job as mentioned.
A15
A14
A13
A11
Ao
Vcc
PA0
R
R
IORD
RD
PA1
Stepper
IOWR
A2
R
Motor
WR
PA3
Do-D7
8255
PPI
A1
Ao
A2
A1
CS
PCo
PC1
R
Fig.2: Stepper Motor interfaced with 8255

2. A stepper motor is connected with the 8086-microprocessor system using the 8255-
programmable peripheral interfacing IC. The four phases of the motor are connected to
Port-A as shown in figure 2. Two control switches are connected to Port-C. The control on
motor should be done as follows:
PC1 PCo
Motor Operation
0
0
Off
0
1
1-phase Full-step mode
1
0
2-phase Full-step mode
1
1
Half-step mode
(a) Find the addresses of the ports and control register,
(b) Find the control word,
(c) Write an assembly language program to perform the job as mentioned.
A15
A14
A13
A11
Ao
Vcc
PA0
R
R
IORD
RD
PA1
Stepper
IOWR
A2
R
Motor
WR
PA3
Do-D7
8255
PPI
A1
Ao
A2
A1
CS
PCo
PC1
R
Fig.2: Stepper Motor interfaced with 8255

Added by David D.

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