Digi NS9750 - Manual (Page 649)

w w w . d i g i e m b e d d e d . c o m 6 2 5
S e r i a l C o n t r o l M o d u l e : U A R T
D28 R/W TXSRC 0 Transmit clock source
0 Internal
1 External (input using GPIO pin)
Controls the source of the transmitter clock. The
transmitter clock can be provided by an internal source
selected using the TICS field (see D16).
As an alternative, the transmitter clock can be provided by
an input on GPIO pins gpio[7], gpio[15], gpio[23], and
gpio[27] for serial ports B, A, C, and D, respectively.
D27 R/W RXEXT 0 Drive receive clock external
0 Disable
1 Enable
Enables the receiver clock to be driven on GPIO pins
gpio[6], gpio[14], gpio[22], and gpio[26] for serial ports
B, A, C, and D, respectively.‘
D26 R/W TXEXT 0 Drive transmit clock external
0 Disable
1 Enable
Enables the transmitter clock to be driven on GPIO pins
gpio[7], gpio[15], gpio[23], gpio[27] for serial ports B, A,
C, and D, respectively.
Bits Access Mnemonic Reset Description
Table 370: Serial Channel B/A/C/D Bit-rate register