ISD94100 Series Technical Reference Manual
Sep 9, 2019
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Rev1.09
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ICA
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NCE
M
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460800
Not recommended
BRD=0, EDIVM1 =13
BRD=24
230400
Not recommended
BRD =2, EDIVM1 =13
BRD =50
115200
Not recommended
BRD =6, EDIVM1 =13
BRD =102
57600
BRD =11
BRD =14, EDIVM1 =13
BRD =206
38400
BRD =18
BRD =22, EDIVM1 =13
BRD =311
19200
BRD =37
BRD =123, EDIVM1 =5
BRD =623
9600
BRD =76
BRD =123, EDIVM1 =10
BRD =1248
4800
BRD =154
BRD =248, EDIVM1 =10
BRD =2498
Table 6.12.5-2 UART controller Baud Rate Parameter Setting Example Table
UART Peripheral Clock = 12 MHz
Baud Rate
UART_BAUD Value
Mode 0
Mode 1
Mode 2
921600
Not support
Not recommended
0x3000_000B
460800
Not recommended
0x2D00_0000
0x3000_0018
230400
Not recommended
0x2D00_0002
0x3000_0032
115200
Not recommended
0x2D00_0006
0x3000_0066
57600
0x0000_000B
0x2D00_000E
0x3000_00CE
38400
0x0000_0012
0x2D00_0016
0x3000_0137
19200
0x0000_0025
0x2500_007B
0x3000_026F
9600
0x0000_004C
0x2A00_007B
0x3000_04E0
4800
0x0000_009A
0x2A00_00F8
0x3000_09C2
Table 6.12.5-3 UART controller Baud Rate Register Setting Example Table
6.12.5.2 UART Controller Baud Rate Compensation
The ISD94100 series UART controller supports baud rate compensation function. It is used to
optimize the precision for each bit. Two examples are given below to explain the compensation
mechanism.
-
BRCOMPDEC bit (UART_BRCOMP[31])
•
= 0: positive compensation, increase one UART clock cycle,
•
= 1: negative compensation, decrease one UART clock cycle.
-
BRCOMP bits (UART_BRCOMP[8:0]: for each bit in BRCOMP, ‘1’ means to do
compensation, while ‘0’ means not to do compensation.
Example:
(1). UART’s peripheral clock = 32.768K and baud rate is 9600
Baud rate is 9600, UART peripheral clock is 32.768K
3.413 peripheral clock/bit
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