This document discusses using microprocessors for sequencing tasks. It describes the basic components of a microprocessor system including the power supply, microprocessor, memory, input-output, and bus. It explains how to program the microprocessor using low-level languages like assembly, which uses hexadecimal numbers and symbolic representations. An example is provided of using a microprocessor to control a cylinder, including defining the sequence, writing an assembly program, and converting it to machine code.

1. USE OF MICROPROCESSORS FOR
SEQUENCING

2. MICROPROCESSORS
CONSTRUCTION
• Power supply
• Microprocessors
• Memory
• Input-output
• Bus

3. PROGRAMMING THE
MICROPROCESSOR
• Low –level language programming
(OR)
• High –level language programming

4. Low –level language programming
• Hexadecimal number system used for this.
• Hexadecimal number is to a base of 16.
• The digits from 1to9 and A,B,C,D,E,F. assembly
language is a symbolic from of machine code.
Machine code Assembly language Explanation
3E LDA n Load accumulator A
with data n
18 JR, DIS Jump relative
CD CALL nn Call subroutine at
address nn

5. EXAMPLE

6. PROGRAMMING
• STEP1 :Define the sequence of operation
• Provide a signal of +5v from bit 1 of port A
piston rod is out.
• Piston rod is extended by reading the signal
from the limit switch at bit 0 of port b.
• Clear the signal from port a to de- energies
the solenoid and retract the cylinder.

7. PROGRAMMING

8. PROGRAMMING
• Step3 : write a assembly program
Assembly language COMMENTS
LDA, 0F Load accumulator with 0F
LDA, FF Load accumulator A with CF
OUT(80),A Provide a signal of +5v and energies
the solenoid
IN A (82) Part B is loaded into the accumulator
A
OUT(80),A Load port A with content of A this
switches the solenoid off retracts the
piston rod.

9. PROGRAMMING
• STEP 4: Convert Into Machine Code
Address of memory Machine Code Assembly Language
3000 3E LDA, 0F
3004 3E LDA, FF
300A D3 OUT(80),A
3010 DB IN A (82)

10. THANK YOU