CP s |
Compare opearand s to accumulator. |
Function: |
A - s |
Format: |
s: may be r, n, (HL), (IX + d), or (IY + d) |
r |
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n |
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byte 1: FE |
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byte 2: immediate data |
(HL) |
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BE |
(IX + d) |
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byte 1: DD |
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byte 2: BE |
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byte 3: offset data |
(IY + d) |
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byte 1: FD |
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byte 2: BE |
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byte 3: offset data |
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r may be any one of:
- A
- 111
- B
- 000
- C
- 001
- D
- 010
- E
- 011
- H
- 100
- L
- 101
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Description: |
The specified operand is subtracted from the accumulator, and the result is discarded. s is defined in the descriptions of the ADD instructions. |
Data Flow: |
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Timing: |
s: |
M cycles: |
T states: |
usec @ 2 MHz: |
r
n
(HL)
(IX + d)
(IY + d) |
1
2
2
5
5 |
4
7
7
19
19 |
2
3.5
3.5
9.5
9.5 |
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Addressing Mode: |
r: implicit; n: immediate; (HL): indirect; (IX + d), (IY+d): indexed. |
Byte Codes: |
CP r
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Flags: |
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Example: |
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OBJECT CODE |
Before: |
After: |
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