Command Register (Cr) - Motorola MC68340 User Manual

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.
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).
MOTOROLA
Freescale Semiconductor, Inc.
Table 7-5. TCSx Control Bits
TCS3 TCS2 TCS1
0 0 0
0 0 0
0 0 1
0 0 1
0 1 0
0 1 0
0 1 1
0 1 1
1 0 0
1 0 0
1 0 1
1 0 1
1 1 0
1 1 0
1 1 1
1 1 1
CRA, CRB
7 6 5 4
MISC3 MISC2 MISC1 MISC0
RESET:
0 0 0 0
Write Only
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TCS0 Set 1 Set 2
0 50 75
1 110 110
0 134.5 134.5
1 200 150
0 300 300
1 600 600
0 1200 1200
1 1050 2000
0 2400 2400
1 4800 4800
0 7200 1800
1 9600 9600
0 38.4k 19.2k
1 76.8k 38.4k
0 SCLK/16 SCLK/16
1 SCLK/1 SCLK/1
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3 2 1 0
TC1 TC0 RC1 RC0
0 0 0 0
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