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13. 8085 programming example v
- 1. MICROPROCESSOR 8085 LECTURE 16 PROGRAMMING EXAMPLE-VII STACK & SUBROUTINE PROF. SANDIP DAS
- 3. STACK AA 33 2F 0001 0000 0003 0002 0004 0005 0006 0007 0008 0009 2000 LXI SP 0009 SP=0009 2003 LXI H 2F332006 PUSH H PC=2000 PC=2003 PC=2006 When PUSH instruction is executed 1. SP will be decremented by 1 2. H will be inserted into the memory location pointed by stack pointer 3. Again SP will be decremented by 1 4. L will be inserted into the new memory location pointed by SP SP=0008 SP=0007 H L 2F 33 EXAMPLE OF PUSH INSTRUCTION
- 4. STACK AA 33 2F 0001 0000 0003 0002 0004 0005 0006 0007 0008 0009 2000 LXI SP 0009 SP=0009 2003 LXI H 2F332006 PUSH H PC=2000 PC=2003 PC=2006 SP=0008 SP=0007 EXAMPLE OF POP INSTRUCTION 2007 POP B PC=2007 B 2F C 33
- 5. SUBROUTI NE Memory address Mnemonics, operands 2000 LXI SP,20CD H 2003 LXI H,0108 H 2006 MVI B,0F H 2008 CALL 2060 H 200B DCR B 2060 PUSH H 2061 PUSH B 2062 MVI B,05H 2065 POP H 2066 POP B 2067 RET 0F CB 08 01 STACK 20CD SP=20CD REGISTE R B C H 0F L 08 2000 2006 2003 2008 2060 2062 2061 2065 MAIN MEMORY SUBROUTINE 2066 2067 200B 20CC 20CB 20CA 00 01 080F 05 01