Intel 80C188XL - Manual (Page 357)

INSTRUCTION SET DESCRIPTIONS
C-34
POPA Pop All:
POPA
Pops all data, pointer, and index
registers off of the stack. The SP value
popped is discarded.
Instruction Operands:
none
(DI)
←
((SP) + 1:(SP))
(SP)
←
(SP) + 2
(SI) ← ((SP) + 1:(SP))
(SP)
←
(SP) + 2
(BP) ← ((SP) + 1:(SP))
(SP)
←
(SP) + 2
(BX)
←
((SP) + 1:(SP))
(SP)
←
(SP) + 2
(DX)
←
((SP) + 1:(SP))
(SP) ← (SP) + 2
(CX)
←
((SP) + 1:(SP))
(SP)
←
(SP) + 2
(AX)
←
((SP) + 1:(SP))
(SP)
←
(SP) + 2
AF –
CF –
DF –
IF –
OF –
PF –
SF –
TF –
ZF –
POPF Pop Flags:
POPF
Transfers specific bits from the word at
the current top of stack (pointed to by
register SP) into the 8086/8088 flags,
replacing whatever values the flags
previously contained. SP is then
incremented by two to point to the new
top of stack.
Instruction Operands:
none
Flags
←
((SP) + 1:(SP))
(SP) ← (SP) + 2
AF ü
CF ü
DF ü
IF ü
OF ü
PF ü
SF ü
TF ü
ZF ü
PUSH Push:
PUSH src
Decrements SP by two and then
transfers a word from the source
operand to the top of stack now
pointed to by SP.
Instruction Operands:
PUSH reg
PUSH seg-reg (CS legal)
PUSH mem
(SP)
←
(SP) – 2
((SP) + 1:(SP))
←
(src)
AF –
CF –
DF –
IF –
OF –
PF –
SF –
TF –
ZF –
Table C-4. Instruction Set (Continued)
Name Description Operation
Flags
Affected
NOTE: The three symbols used in the Flags Affected column are defined as follows:
– the contents of the flag remain unchanged after the instruction is executed
? the contents of the flag is undefined after the instruction is executed
ü the flag is updated after the instruction is executed