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Chapter 13
Serial Interface Function
Preliminary User’s Manual U15839EE1V0UM00
When the latch timing margin is made 2 basic clocks (Clock), the minimum allowable transfer rate
(FLmin) is as follows.
Therefore, the transfer destination’s maximum baud rate (BRmax) that can be received is as
follows.
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 UART5n and the transfer destination can be obtained as follows
from the expressions described above for computing the minimum and maximum baud rate
values.
Table 13-5:
Maximum and Minimum Allowable Baud Rate Error
Remarks: 1. The reception precision depends on the number of bits in one frame, the basic clock
frequency, 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%
FLmin
11 FL
×
k
2
–
2
k
------------
FL
×
–
21
k
2
+
2
k
-------------------
FL
×
=
=
BRmax
FLmin
11
----------------
1
–
22
k
21
k
2
+
-------------------
BR
×
=
=
10
11
------ FLmax
×
11 FL
×
k
2
+
2
k
------------
FL
×
–
21
k
2
–
2
k
-------------------
FL
×
=
=
FLmax
21
k
2
–
20
k
-------------------
FL
11
×
×
=
BRmin
FLmax
11
------------------
1
–
20
k
21
k
2
+
-------------------
BR
×
=
=
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