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Chapter 12
Serial Interface Function
Preliminary User’s Manual U14913EE1V0UM00
Similarly, the maximum allowable transfer rate (FLmax) can be obtained as follows.
Therefore, the transfer destination’s minimum baud rate (BRmin) that can be received is as follows.
The allowable baud rate error of UARTn and the transfer destination can be obtained as follows
from the expressions described above for computing the minimum and maximum baud rate values.
Table 12-5: Maximum and Minimum Allowable Baud Rate Error
Remarks: 1. The reception precision depends on the number of bits in one frame, the basic clock fre-
quency, and the division ratio (k). The higher the basic clock frequency and the larger the
division ratio (k), the higher the precision.
2. k: BRGCm setting value
Division Ratio (k)
Maximum Allowable
Baud Rate Error
Minimum Allowable
Baud Rate Error
8
+3.53%
–3.61%
20
+4.26%
–4.31%
50
+4.56%
–4.58%
100
+4.66%
–4.67%
255
+4.72%
–4.73%
10
11
------
FLmax
×
11
FL
×
k
2
+
2k
------------
FL
×
–
21k
2
–
2k
-------------------
FL
×
=
=
FLmax
21k
2
–
20k
-------------------
FL
11
×
×
=
BRmin
FLmax
11
------------------
1
–
20k
21k
2
+
-------------------
BR
×
=
=
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