Motorola MC68340 manual TCSx Control Bits, Cra, Crb

Freescale Semiconductor, Inc.

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	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

7.4.1.7COMMAND 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

MOTOROLAMC68340 USER’S MANUAL7- 27

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