539
Asynchronous Serial Interface (UARTA)
Chapter 16
Preliminary User’s Manual U17566EE1V2UM00
Therefore, the minimum baud rate that can be received by the destination is as
follows.
Obtaining the allowable baud rate error for UARTAn and the destination from
the above-described equations for obtaining the minimum and maximum baud
rate values yields the following.
Table 16-10
Maximum/Minimum allowable baud rate error
Note
1.
The reception accuracy depends on the bit count in 1 frame, the input clock
frequency, and the division ratio (k). The higher the input clock frequency
and the larger the division ratio (k), the higher the accuracy.
2.
k: Setting value of UAnCTL2.UAnBRS[7:0]
BRm
in
FLmax
11
⁄
(
)
1
–
20k
21
k
2
–
-------------------
Brate
×
=
=
Division ratio (k)
Maximum allowable baud rate error
Minimum allowable baud rate error
4
+2.32%
-
2.43%
8
+3.52%
-
3.61%
20
+4.26%
-
4.30%
50
+4.56%
-
4.58%
100
+4.66%
-
4.67%
255
+4.72%
-
4.72%
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