640
Chapter 15
Asynchronous Serial Interface C (UARTC)
User’s Manual U16580EE3V1UD00
15.6.2 Baud
rate
The baud rate is obtained by the following equation.
f
XCLK
= Frequency of base clock (Clock) selected by bits UCnCKS3 to UCnCKS0 of UCnCTL1 register
k = Value set using bits UCnBRS7 to UCnBRS0 of UCnCTL2 register (k = 4, 5, 6,..., 255)
15.6.3 Baud rate error
The baud rate error is obtained by the following equation.
Cautions: 1. The baud rate error during transmission must be within the error tolerance on the
receiving side.
2. The baud rate error during reception must satisfy the range indicated in section
15.6.5 ”Allowable baud rate range during reception” on page 642.
Example
Base clock (f
XCLK
) frequency = 16 MHz = 16,000,000 Hz
Setting value of bits UCnBRS7 to UCnBRS0 of UCnCTL2 register = 00110100B (k = 52)
Target baud rate = 153,600
Baud rate = 16,000,000/ (2
×
52) = 153,846 [bps]
Error = (153,846/153,600 - 1)
×
100
= 0.160 [%]
Baud rate = [bps]
2
×
k
f
XCLK
Error
Actual baud rate (baud rate with error)
Desired baud rate (correct baud rate)
-----------------------------------------------------------------------------------------------------
1
–
⎝
⎠
⎛
⎞
100
×
=
%
[ ]
Содержание MuPD70F3187
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Страница 976: ...976 Chapter 22 Internal RAM Parity Check Function User s Manual U16580EE3V1UD00 MEMO ...
Страница 984: ...984 Chapter 23 On Chip Debug Function OCD User s Manual U16580EE3V1UD00 MEMO ...
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