MC68306FC16 Datasheet, PDF (132/191 Pages) Motorola, Inc – Integrated EC000 Processor

RxRDY—Receiver Ready
1 = One or more characters has been received in channel B and is waiting in the
receiver buffer FIFO.
0 = The CPU has read the receiver buffer, and no characters remain in the FIFO
after this read.
6.4.1.4 CLOCK-SELECT REGISTER (DUCSR). The DUCSR selects the baud rate clock
for the channel receiver and transmitter.
DUCSRA, DUCSRB
7
6
5
4
RCS3 RCS2 RCS1 RCS0
RESET:
0
0
0
0
Write Only
3
TCS3
0
2
TCS2
0
1
TCS1
0
0
TCS0
0
RCS3–RCS0—Receiver Clock Select
These bits select the baud rate clock for the channel receiver from a set of baud rates
listed in Table 6-5. The baud rate set selected depends upon the auxiliary control
register (DUACR) bit 7. Set 1 is selected if DUACR bit 7 = 0, and set 2 is selected if
DUACR bit 7 = 1. The receiver clock is always 16 times the baud rate shown in this list,
except when the clock select bits = 1111.
6-24
MC68306 USER'S MANUAL
MOTOROLA