Z8 Microcontrollers
ZiLOG Instruction Descriptions and Formats
UM001601-0803 12-49
POP
POP
POP
Pop
POP dst
Instruction Format:
Operation:
dst <— @SP
SP <— SP + 1
The contents of the location specified by the SP (Stack Pointer) are loaded into the destination operand. The SP is
then incremented automatically.
Note:
Address modes R or IR can be used to specify a 4-bit Working Register. In this format, the destination Working
Register operand is specified by adding 1110B (EH) to the high nibble of the operand. For example, if Working
Register R12 (CH) is the destination operand, then ECH will be used as the destination operand in the Op Code.
Example:
If the SP (Control Registers FEH and FFH) contains the value 70H and Register 70H contains 44H, the statement:
POP 34H
Op Code: 50 34
loads the value 44H into Register 34H. After the POP operation, the SP contains 71H. The contents of Register 70
are not affected.
Example:
If the SP (Control Registers FEH and FFH) contains the value 1000H, external data memory location 1000H
contains 55H, and Working Register R6 contains 22H, the statement:
POP @R6
Op Code: 51 E6
loads the value 55H into Register 22H. After the POP operation, the SP contains 1001H. The contents of Working
Register R6 are not affected.
Flags: C: Unaffected
Z: Unaffected
S: Unaffected
V: Unaffected
D: Unaffected
H: Unaffected
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