Dec sp, Operation, Description – Zilog EZ80F916 User Manual
Page 148: Condition bits affected, Attributes
eZ80
®
CPU
User Manual
UM007715-0415
CPU Instruction Set
139
DEC SP
Decrement
Operation
SP
SP – 1
Description
The value contained in the Stack Pointer (SP) register is decremented by 1. In ADL mode,
or when the .L suffix is employed, SPL is used for SP. In Z80 mode, or when the .S suffix
is employed, the SPS is used for SP.
Condition Bits Affected
None.
Attributes
Mnemonic
Operand
ADL Mode
Cycle
Opcode (hex)
DEC
SP
X
1
3B
DEC.S
SP
1
2
52, 3B
DEC
.L
SP
0
2
49, 3B
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