IN r,(C)
(C)| 1 | 1 | 1 | 0 | 1 | 1 | 0 | 1 |
| 0 | 1 | r | r | r | 0 | 0 | 0 |
C provides bits A0 to A7 of the address bus.
B provides bits A8 to A15.
It is important to note that IN A,(N) does not have any effect on the flags, while IN r,(C) does.
OBJECT CODE
IN r,(C) |
Load register r from port (C). | |||||||||
| Function: | r
(C) |
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| Format: |
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byte 1: ED |
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byte 2 |
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| Description: | The peripheral device addressed by the contents of the C register is read and the result is loaded into the specified register. C provides bits A0 to A7 of the address bus. B provides bits A8 to A15. |
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| Data Flow: | ||||||||||
| Timing: | 3 M cycles; 12 T states: 6 usec @ 2 MHz |
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| Addressing Mode: | external |
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| Byte Codes: | ||||||||||
| Flags: | It is important to note that IN A,(N) does not have any effect on the flags, while IN r,(C) does. |
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| Example: | ||||||||||
OBJECT CODE |
Before: |
After: |
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