Z8F4822AR020SG Datasheet, PDF (127/323 Pages) Zilog, Inc. – High Performance 8-Bit Microcontrollers

Z8 Encore! XP^® F64xx Series
Product Specification
107
Table 62. UART Baud Rates
20.0 MHz System Clock
Desired
Rate
(kHz)
BRG
Divisor Actual Rate
(Decimal) (kHz)
Error
(%)
1250.0
1
1250.0
0.00
625.0
2
625.0
0.00
250.0
5
250.0
0.00
115.2
11
113.6
–1.36
57.6
22
56.8
–1.36
38.4
33
37.9
–1.36
19.2
65
19.2
0.16
9.60
130
9.62
0.16
4.80
260
4.81
0.16
2.40
521
2.40
–0.03
1.20
1042
1.20
–0.03
0.60
2083
0.60
0.02
0.30
4167
0.30
–0.01
16.667 MHz System Clock
Desired
Rate
(kHz)
BRG
Divisor Actual Rate
(Decimal) (kHz)
Error
(%)
1250.0
1
1041.69 –16.67
625.0
2
520.8
–16.67
250.0
4
260.4
4.17
115.2
9
115.7
0.47
57.6
18
57.87
0.47
38.4
27
38.6
0.47
19.2
54
19.3
0.47
9.60
109
9.56
–0.45
4.80
217
4.80
–0.83
2.40
434
2.40
0.01
1.20
868
1.20
0.01
0.60
1736
0.60
0.01
0.30
3472
0.30
0.01
18.432 MHz System Clock
Desired
Rate
(kHz)
BRG
Divisor Actual Rate
(Decimal) (kHz)
Error
(%)
1250.0
1
1152.0 –7.84%
625.0
2
576.0 –7.84%
250.0
5
230.4 –7.84%
115.2
10
115.2
0.00
57.6
20
57.6
0.00
38.4
30
38.4
0.00
19.2
60
19.2
0.00
9.60
120
9.60
0.00
4.80
240
4.80
0.00
2.40
480
2.40
0.00
1.20
960
1.20
0.00
0.60
1920
0.60
0.00
0.30
3840
0.30
0.00
11.0592 MHz System Clock
Desired
Rate
(kHz)
BRG
Divisor Actual Rate
(Decimal) (kHz)
Error
(%)
1250.0
N/A
N/A
N/A
625.0
1
691.2
10.59
250.0
3
230.4
–7.84
115.2
6
115.2
0.00
57.6
12
57.6
0.00
38.4
18
38.4
0.00
19.2
36
19.2
0.00
9.60
72
9.60
0.00
4.80
144
4.80
0.00
2.40
288
2.40
0.00
1.20
576
1.20
0.00
0.60
1152
0.60
0.00
0.30
2304
0.30
0.00
PS019924-0113
PRELIMINARY
UART Control Register Definitions