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Z8F021ASH020SC 数据表(PDF) 126 Page - Zilog, Inc.

部件名 Z8F021ASH020SC
功能描述  Z8 Encore XP-R 4K Series High-Performance 8-Bit Microcontrollers
PDF  276 Pages
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制造商  ZILOG [Zilog, Inc.]
网页  http://www.zilog.com
标志 ZILOG - Zilog, Inc.

Z8F021ASH020SC 数据表(HTML) 126 Page - Zilog, Inc.

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PS022815-0206
UART
Z8 Encore! XP® 4K Series
Product Specification
107
The UART data rate is calculated using the following equation:
For a given UART data rate, calculate the integer baud rate divisor value using the follow-
ing equation:
The baud rate error relative to the acceptable baud rate is calculated using the following
equation:
For reliable communication, the UART baud rate error must never exceed 5 percent.
Table 71 provides information about data rate errors for popular baud rates and commonly
used crystal oscillator frequencies.
Table 71. UART Baud Rates
10.0 MHz System Clock
5.5296 MHz System Clock
Acceptable
Rate (KHz)
BRG Divisor
(Decimal)
Actual Rate
(KHz)
Error
(%)
Acceptable
Rate (KHz)
BRG Divisor
(Decimal)
Actual Rate
(KHz)
Error
(%)
1250.0
N/A
N/A
N/A
1250.0
N/A
N/A
N/A
625.0
1
625.0
0.00
625.0
N/A
N/A
N/A
250.0
3
208.33
-16.67
250.0
1
345.6
38.24
115.2
5
125.0
8.51
115.2
3
115.2
0.00
57.6
11
56.8
-1.36
57.6
6
57.6
0.00
38.4
16
39.1
1.73
38.4
9
38.4
0.00
19.2
33
18.9
0.16
19.2
18
19.2
0.00
9.60
65
9.62
0.16
9.60
36
9.60
0.00
4.80
130
4.81
0.16
4.80
72
4.80
0.00
2.40
260
2.40
-0.03
2.40
144
2.40
0.00
1.20
521
1.20
-0.03
1.20
288
1.20
0.00
0.60
1042
0.60
-0.03
0.60
576
0.60
0.00
0.30
2083
0.30
0.2
0.30
1152
0.30
0.00
UART Baud Rate (bits/s)
System Clock Frequency (Hz)
16 UART Baud Rate Divisor Value
×
----------------------------------------------------------------------------------------------
=
UART Baud Rate Divisor Value (BRG)
Round
System Clock Frequency (Hz)
16 UART Data Rate (bits/s)
×
----------------------------------------------------------------------------
⎝⎠
⎛⎞
=
UART Baud Rate Error (%)
100
Actual Data Rate Desired Data Rate
–
Desired Data Rate
-------------------------------------------------------------------------------------------------
⎝⎠
⎛⎞
×
=



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