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SN8F5708 Datasheet(PDF) 138 Page - SONiX Technology Company

Part # SN8F5708
Description  8051-based Microcontroller
PDF  204 Pages
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Manufacturer  SONIX [SONiX Technology Company]
Direct Link  http://www.sonix.com.tw
Logo SONIX - SONiX Technology Company

SN8F5708 Datasheet(HTML) 138 Page - SONiX Technology Company

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SN8F5708 Series
Copyright © 2019, SONiX Technology Co., Ltd.
UART
Datasheet Rev. 2.4
138
Table 20-1 Recommended Setting for Common UART Baud Rates (fcpu = 8 MHz)
Baud Rate
SMOD
S0RELH
S0RELL
Accuracy
4800
0
0x03
0xE6
0.16 %
9600
0
0x03
0xF3
0.16 %
19200
1
0x03
0xF3
0.16 %
38400
1
0x03
0xF9
-6.99 %
56000
1
0x03
0xFB
-10.71 %
57600
1
0x03
0xFC
8.51 %
115200
1
0x03
0xFE
8.51 %
128000
1
0x03
0xFE
-2.34 %
250000
1
0x03
0xFF
0 %
If the Timer 1 overflow period is selected (BD = 0) in mode 1 and 3, the baud rate is generated as
following equation. The Timer 1 must be in 8-bit auto-reload mode which can generate periodically
overflow signals.
Baud Rate = 2SMOD ×
1
32 × Timer 1 period
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Table 20-2 Recommended Setting T1 overflow period (T1 clock=32M) for Common UART Baud Rates (fcpu = 8 MHz)
Baud Rate
SMOD
Timer Period
TH1/TL1
Accuracy
4800
0
6.510 us
0x30
0.16 %
9600
1
6.510 us
0x30
0.16 %
19200
1
3.255 us
0x98
0.16 %
38400
1
1.628 us
0xCC
0.16 %
56000
1
1.116 us
0xDC
-0.80 %
57600
1
1.085 us
0xDD
-0.80 %
115200
1
0.543 us
0xEF
2.08 %
128000
1
0.488 us
0xF0
-2.40 %
Note:
1. When baud rate generator source is T1 overflow rate, the max counter value is
0xFB. (Only supports 0x00~0xFB).
2. When baud rate generator source is T1 overflow rate, the system clock fcpu must
be greater four times to T1 overflow rate.



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