Intel 80C188EC User Manual page 465

INSTRUCTION SET DESCRIPTIONS
Name
POPA Pop All:
POPA
Pops all data, pointer, and index
registers off of the stack. The SP value
popped is discarded.
Instruction Operands:
none
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
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
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
C-34
Table C-4. Instruction Set (Continued)
Description Operation
(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
Flags ← ((SP) + 1:(SP))
(SP) ← (SP) + 2
(SP) ← (SP) – 2
((SP) + 1:(SP)) ← (src)
Flags
Affected
AF –
CF –
DF –
IF –
OF –
PF –
SF –
TF –
ZF –
ü
AF
ü
CF
ü
DF
ü
IF
ü
OF
ü
PF
ü
SF
ü
TF
ü
ZF
AF –
CF –
DF –
IF –
OF –
PF –
SF –
TF –
ZF –