Usart baud rate generator register – Rainbow Electronics AT75C220 User Manual
Page 92
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AT75C220
92
USART Baud Rate Generator Register
Name:
US_BRGR
Access Type:Read/write
Reset Value: 0x0
•
CD: Clock Divisor
This register has no effect if synchronous mode is selected with an external clock.
Note:
In synchronous mode, the value programmed must be even to ensure a 50:50 mark-to-space ratio.
Note:
Clock divisor bypass (CD = 1) must not be used when internal clock ACLK is selected (USCLKS = 0).
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
–
–
–
–
–
–
–
15
14
13
12
11
10
9
8
CD
7
6
5
4
3
2
1
0
CD
CD
Effect
0
Disables clock
1
Clock divisor bypass
2 to 65535
Baud rate (asynchronous mode) = Selected clock/(16 x CD)
Baud rate (synchronous mode) = Selected clock/CD
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