CHAPTER 12 SERIAL INTERFACE FUNCTION
Preliminary User’s Manual U15905EJ1V0UD
328
Therefore, the transfer destination’s maximum receivable baud rate (BRmax) is as follows.
Brate
2
k
21
22k
(FLmin/11)
BRmax
1
+
=
=
−
Similarly, the maximum allowable transfer rate (FLmax) can be obtained as follows.
FL
k
2
2
k
21
FL
k
2
2
k
FL
11
FLmax
11
10
×
−
=
×
×
+
−
×
=
×
11
FL
k
20
2
k
21
FLmax
×
−
=
Therefore, the transfer destination’s minimum receivable baud rate (BRmin) is as follows.
Brate
2
k
21
20k
(FLmax/11)
BRmin
1
−
=
=
−
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 12-4. Maximum and Minimum Allowable Baud Rate Error
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%
Remarks
1.
The reception precision depends on the number of bits in one frame, the base clock frequency,
and the division ratio (k). The higher the base clock frequency and the larger the division ratio
(k), the higher the precision.
2.
k: BRGCn setting value
Summary of Contents for V850ES/SA2 UPD703201
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