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MICROPROCESSOR INSTRUCTION REFERENCE->TSTIO
TSTIO n Test I/O port. Port (C) and immediate data n are ANDed and the status flags are updated
(C) 'and' n
C to A0-A7
0 to A8-A15
Flags
| S | Set if result -ve, else cleared |
| Z | Set if result 0, else cleared |
| H | Set always |
| P/V | Set if parity even, else cleared |
| N | Cleared always |
| C | Cleared always |
| No of | M | T | usec @ |
| bytes | cycles | states | 2 MHz |
| 3 | 4 | 12 | 6 |