Model 100 Serial Interface: Difference between revisions
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|2 || Parity Inhibit || 0 → Parity<br/>1 → No parity | |2 || Parity Inhibit || 0 → Parity<br/>1 → No parity | ||
|- | |- | ||
|4-3 || Character length || | |4-3 || Character length || Bits:<br/>00 → 5<br/>01 → 6<br/>10 → 7<br/>11 → 8 | ||
|- | |- | ||
|7-5 || Unused || | |7-5 || Unused || | ||
Revision as of 15:20, 1 February 2009
Overview
The BASIC ROM provides access to the serial port. BASIC ROM support is well documented elsewhere. This article covers direct use of the IM6402 UART.
Configuration
Serial Word Format
Port $D8 controls the serial word format.
| Bit | Function | Note |
| 0 | Stop bits | 0 → 1 stop bit 1 → 2 or 1.5 stop bits (1.5 if character length is 5, 2 otherwise) |
| 1 | Even/ Odd Parity | 0 → Odd parity 1 → Even |
| 2 | Parity Inhibit | 0 → Parity 1 → No parity |
| 4-3 | Character length | Bits: 00 → 5 01 → 6 10 → 7 11 → 8 |
| 7-5 | Unused |
Baud Rate
Data Transmission
Data Reception
I/O Map
| Name | Direction | Port |
| TX | Output | $C8 |
| RX | Input | $C8 |
| RTS | Output | $BA, bit 7 |
| CTS | Input | $BB, bit 4 |
| DSR | Input | $BB, bit 5 |
| DTR | Output | $BA, bit 6 |
Direction indicates both data flow, and whether to use an IN or OUT instruction to read/write to the given pin.
