User Manual

AT75C220
76
Notes: 1. CD = clock driver
2. For information on obtaining exact baud rates using the value of CD given above, the selected clock frequency must be
23,961,600 Hz (23.9616 MHz).
Figure 16. Baud Rate Generator
38400 39.06 39 38461.5 61.5 0.16
57600 26.04 26 57692.3 92.3 0.16
115200 13.02 13 115384.6 184.6 0.16
Table 23. Clock Generator Table
Required Baud Rate
(bps)
CD = 24 x 10
6
/
16 x baud rate Actual CD Actual Baud Rate (bps) Error (bps) % Error
USCLKS [1]
0
0
1
1
MCKI
MCKI/8
SCK
CLK
16-bit Counter
0
0
1
Baud Rate
Clock
SYNC
USCLKS [1]
CD
CD
OUT
0
1
Divide
by 16
SYNC
0
1
>1
USCLKS [0]