Z8
®
CPU
User Manual
UM001604-0108 Instruction Description
213
POP
Syntax
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 desti-
nation operand. The SP is then incremented automatically.
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 is used as the destination operand in the Op Code.
Example 1
If the SP (Control Registers FEh and FFh) contains the value 70h and Register 70h con-
tains
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.
Cycles
OPC
(Hex)
Address Mode
dst
OPC dst
10 50 R
10 51 IR
Flag Description
C Unaffected
Z Unaffected
S Unaffected
V Unaffected
D Unaffected
H Unaffected
Edst
Note:
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