Typewriter User Manual

MOTOROLA MC68340 USER’S MANUAL 7- 27
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 Set 2
0 0 0 0 50 75
0 0 0 1 110 110
0 0 1 0 134.5 134.5
0 0 1 1 200 150
0 1 0 0 300 300
0 1 0 1 600 600
0 1 1 0 1200 1200
0 1 1 1 1050 2000
1 0 0 0 2400 2400
1 0 0 1 4800 4800
1 0 1 0 7200 1800
1 0 1 1 9600 9600
1 1 0 0 38.4k 19.2k
1 1 0 1 76.8k 38.4k
1 1 1 0 SCLK/16 SCLK/16
1 1 1 1 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
76543210
MISC3 MISC2 MISC1 MISC0 TC1 TC0 RC1 RC0
RESET:
00000000
Write Only Supervisor/User
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cale Semiconductor,
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