User's Manual

THE 80286 INSTRUCTION SET
PUSHA-Push All General Registers
Opcode Instruction
60 PUSHA
FLAGS MODIFIED
None
FLAGS UNDEFINED
None
OPERATION
Clocks
17
Description
Push in order: AX,CX,DX,8X,original
SP,8P,SI,DI
PUSHA saves the registers noted above on the 80286 stack. The stack pointer SP is-decremented by
16 to hold the 8 word values. Since the registers are pushed onto the stack in the order in which they
were given, they will appear in the
16 new stack bytes in the reverse order. The last register pushed is
DI.
PROTECTED MODE EXCEPTIONS
#SS(O) if the starting or ending address is outside the stack segment limit.
REAL ADDRESS MODE EXCEPTIONS
The 80286 will shut down if SP = 1, 3, or 5 before executing PUSHA. If SP = 7, 9, 11, 13, or 15,
exception
13 will occur.
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