CTSEN=DISABLE_AUTO_CTS_FLO, RTSEN=DISABLE_AUTO_RTS_FLO
Modem control register
| DTRC | DTR Control. Source for modem output pin, DTR. This bit reads as 0 when modem loopback mode is active. |
| RTSC | RTS Control. Source for modem output pin RTS. This bit reads as 0 when modem loopback mode is active. |
| RESERVED | Reserved, user software should not write ones to reserved bits. The value read from a reserved bit is not defined. |
| LMS | Loopback Mode Select. The modem loopback mode provides a mechanism to perform diagnostic loopback testing. Serial data from the transmitter is connected internally to serial input of the receiver. Input pin, RXD, has no effect on loopback and output pin, TXD is held in marking state. The four modem inputs (CTS, DSR, RI and DCD) are disconnected externally. Externally, the modem outputs (RTS, DTR) are set inactive. Internally, the four modem outputs are connected to the four modem inputs. As a result of these connections, the upper four bits of the MSR will be driven by the lower four bits of the MCR rather than the four modem inputs in normal mode. This permits modem status interrupts to be generated in loopback mode by writing the lower four bits of MCR. |
| RESERVED | Reserved, user software should not write ones to reserved bits. The value read from a reserved bit is not defined. |
| RTSEN | RTS flow control 0 (DISABLE_AUTO_RTS_FLO): Disable auto-rts flow control. 1 (ENABLE_AUTO_RTS_FLOW): Enable auto-rts flow control. |
| CTSEN | CTS flow control 0 (DISABLE_AUTO_CTS_FLO): Disable auto-cts flow control. 1 (ENABLE_AUTO_CTS_FLOW): Enable auto-cts flow control. |
| RESERVED | Reserved |