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CHAPTER 10 UART
10.4.2 Serial Rate Control Register (SRC)
The serial rate control register (SRC) is to set the UART transmission speed (baud rate).
■ Serial rate control register (SRC)
Figure 10.4-3 Serial rate control register (SRC)
Address Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Initial value
0021
H
——CR CS1 CS0 RC2 RC1 RC0 --011000
B
R/W R/W R/W R/W R/W R/W
RC2 RC1 RC0
Baud rate selection bits
Transfer clock selection bits
Clock rate selection bit
Division
ratio
Baud rate (bps)
4.9152 MHz 5 MHz Clock
1/4 1/4 1/65 PDS division
1/64 1/8 1/16
CS1, CS0,
CR division
0 0 0
2
0
9600
78125 2404
001
2
1
4800
39063 1202
010
2
2
2400
19531 601
011
2
3
1200 9766
300
100
2
4
600
4883
150
101
2
5
300
2441
75
110
2
6
150 1221 38
111
2
7
75 610 19
CS1 CS0
Clock input CR Asynchronous Synchronous
0 0 External clock
01/16
1/1
11/64
0 1 PWM timer
01/16
1/2
11/64
10
Dedicated baud
rate generator
01/16
1/2
11/64
1 1
1/8
1/1
CR
0 1/16 of clock input
1 1/64 of clock input
Note: When CS1 and CS0 = "11B", the 1/8 clock rate is selected irrespective
of the value of the CR bit.
R/W : Readable and writable
: Initial value
: Unused