Freescale Semiconductor, Inc.
TCS3–TCS0—Transmitter Clock Select
These bits select the baud rate clock for the channel transmitter from a set of baud rates
listed in Table 7-5. The baud rate set selected depends upon ACR bit 7. Set 1 is
selected if ACR bit 7 = 0, and set 2 is selected if ACR bit 7 = 1. The transmitter clock is
always 16 times the baud rate shown in this list, except when SCLK is used.
Table 7-5. TCSx Control Bits
TCS3
TCS2 TCS1 TCS0
Set 1
50
Set 2
75
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
110
110
134.5
200
134.5
150
300
300
600
600
1200
1050
2400
4800
7200
9600
38.4k
76.8k
1200
2000
2400
4800
1800
9600
19.2k
38.4k
SCLK/16 SCLK/16
SCLK/1 SCLK/1
7.4.1.7 COMMAND REGISTER (CR). The CR is used to supply commands to the
channel. Multiple commands can be specified in a single write to the CR if the commands
are not conflicting—e.g., reset transmitter and enable transmitter commands cannot be
specified in a single command. This register can only be written when the serial module is
enabled (i.e., the STP bit in the MCR is cleared).
CRA, CRB
$712, $71A
7
6
5
4
3
2
1
0
MISC3 MISC2 MISC1 MISC0
TC1
TC0
RC1
RC0
RESET:
0
0
0
0
0
0
0
0
Write Only
Supervisor/User
MOTOROLA
MC68340 USER’S MANUAL
7- 27
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