4.4 Quatech Modem Control Register
The Quatech Modem Control Register can be used to set up each port. To access the QMCR write a 0xBF to the LCR (base + 3) and a 0x10 to the Options Register (base+7). This will allow the user read/write access to the QMCR. The QMCR of the entire
Bit | Description |
|
|
7 (MSB) | 0 (always 0) |
6 | 0 (always 0) |
|
|
5 | 0 - RXEN=1 |
| 1 - RXEN=!TXEN |
4 | 0 - Bits 2 and 3 are used |
| 1 - RCLK=TCLK,CTS=RTS, |
| AUXOUT=AUXIN |
3 | 0 - RCLK=TCLK,CTS=AUXIN |
| 1 - RCLK=AUXIN, CTS=RTS |
2 | 0 - AUXOUT=RTS |
| 1- AUXOUT=TCLK |
00 - TXEN “Auto” | |
| 01 - TXEN=DTR |
| 10 - TXEN=RTS |
| 11 - TXEN TOGGLES DURING |
Figure 9a --- Quatech Modem Control Register
18 |