8085 Microprocessor :: Miscellaneous Instructions

i) PUSH

• Syntax: PUSH reg. pair
• e.g. PUSH B

Before instruction B=32, C=57 SP=2099

After instruction M [2097]=57 M [2098]=32 SP=2097

ii) POP

• Syntax: POP reg. pair
• e.g. POP H

Before instruction SP=2090 M [2090]=F5 M [2091]=01

After instruction H=01 L=F5 SP=2092

iii) EI

• Enabling interrupts

iv) DI

• Disabling interrupts

v) PCHL

• The contents of registers H and L are copied to the program counter.

vi) SPHL

• The contents of registers H and L are copied to the stack pointer register.

vii) XTHL

• Exchange H and L with Top of Stack