Subject: Microprocessor and Application Week 2 Chapter 2 Circuit and Operation

1. Chapter 2: Circuit and System
Operation

2. MCS51 System Circuit

3. • Pin configuration
– Power
– Ground
– System Clock (18, 19 Crystal pin)
• Operation Sample Add A, R1
• Machine Cycle is package of clock signal
– Reset
– External Access (/EA)
• Port
• Schematic
• Machine Cycle

4. Pin 40: Power Supply
Handout Chapter 2

5. Pin 20: Ground
Handout Chapter 2

6. Pin 18, 19: Crystal
Handout Chapter 2

7. Pin 31: External Access
Handout Chapter 2

8. Pin 9: Reset
Handout Chapter 2

9. Port
• 32 I/O Lines
• Bidirectional Property
• Bit-Addressable port Property
• Pulled-up Resister pin (Port 1, 2 and 3)
• Open collector pin

10. Port 0
• Handout Chapter 2

11. Port 1
• Handout Chapter 2

12. Port 2
• Handout Chapter 2

13. Port 3
• Handout Chapter 2

14. Basic Output Device
• LED
https://en.wikipedia.org/wiki/Light-emitting_diode

15. Basic Input Device
• Switch
http://www.digibay.in/158-momentary-tactile-dip-push-button-switch

16. MCS51 System Circuit

17. Homework 1
• Draw schematic of MCS51 System circuit with following
specification.
– Reset Switch
– Connect with 8 Display LEDs
– Connect with 4 Push button switches
Check list:
 Identify Component ID for every devices in the diagram (such as U1,
SW1, SW2, LED1, LED2)
 Identify all used Pin Number
 Identify all used Pin Name
 Specify Component's value
 Specify Voltage of Power Supply
Note: Submit Homework BEFORE the next class start.