CTSEN=DISABLE_AUTO_CTS_FLO, RTSEN=DISABLE_AUTO_RTS_FLO, LMS=DISABLE_MODEM_LOOPBA
Modem Control Register.
| DTRCTRL | Source for modem output pin DTR. This bit reads as 0 when modem loopback mode is active. |
| RTSCTRL | 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 DSR, CTS, DCD, and RI pins are ignored. Externally, DTR and RTS are set inactive. Internally, the upper four bits of the MSR are driven by the lower four bits of the MCR. This permits modem status interrupts to be generated in loopback mode by writing the lower four bits of MCR. 0 (DISABLE_MODEM_LOOPBA): Disable modem loopback mode. 1 (ENABLE_MODEM_LOOPBAC): Enable modem loopback mode. |
| RESERVED | Reserved, user software should not write ones to reserved bits. The value read from a reserved bit is not defined. |
| RTSEN | RTS enable 0 (DISABLE_AUTO_RTS_FLO): Disable auto-rts flow control. 1 (ENABLE_AUTO_RTS_FLOW): Enable auto-rts flow control. |
| CTSEN | CTS enable 0 (DISABLE_AUTO_CTS_FLO): Disable auto-cts flow control. 1 (ENABLE_AUTO_CTS_FLOW): Enable auto-cts flow control. |
| RESERVED | Reserved |