Cpcz – Zilog Z16F2810 User Manual
Page 108
CPCZ Instruction
UM018809-0611
92
ZNEO
®
CPU Core
User Manual
CPCZ
Definition
Compare with Carry to Zero
Syntax
CPCZ dst
Operation
dst
–
0
–
C
Description
The value zero and the Carry bit are compared to (subtracted from) the destination operand and
the flags are set according to the results of the operation. The contents of the destination operand
are unaffected. Repeating this instruction enables multiregister compares. The Zero flag is set
only if the initial state of the Zero flag is 1 and the result is 0. This instruction is generated by
using the Extend prefix, 0007H, with the CPZ opcodes.
Flags
Flags are set based on the memory destination size, or 32 bits for register destinations.
7
6
5
4
3
2
1
0
C
Z
S
V
B
CIRQE IRQE
*
*
*
*
1
–
–
–
Legend
C
= Set to 1 if the result generated a borrow; otherwise set to 0.
Z
= Set to 1 if Z is initially 1 and the result is zero; otherwise set to 0.
S
= Set to 1 if the result msb is 1; otherwise set to 0.
V
= Set to 1 if an arithmetic overflow occurs; otherwise set to 0.
B
= Set to 1.
CIRQE
= No change.
IRQE
= No change.
Note: