CHAPTER 13 SERIAL INTERFACE UART0
Preliminary User’s Manual U16315EJ1V0UD
267
Minimum permissible transfer rate: FLmin = 11
×
FL
−
×
FL = FL
Therefore, the maximum receivable baud rate at the transmission destination is as follows.
BRmax = (FLmin/11)
−
1
= Brate
Similarly, the maximum permissible transfer rate can be calculated as follows.
10
k + 2
21k
−
2
11
2
×
k
2
×
k
FLmax = FL
×
11
Therefore, the minimum receivable baud rate at the transmission destination is as follows.
BRmin = (FLmax/11)
−
1
= Brate
The permissible baud rate error between UART0 and the transmission destination can be calculated from the
above minimum and maximum baud rate expressions, as follows.
Table 13-4. Maximum/Minimum Permissible Baud Rate Error
Division Ratio (k)
Maximum Permissible Baud Rate Error
Minimum Permissible Baud Rate Error
8
+3.53%
−
3.61%
16
+4.14%
−
4.19%
24
+4.34%
−
4.38%
31
+4.44%
−
4.47%
Remarks 1.
The accuracy of reception depends on the number of bits in one frame, input clock frequency,
and division ratio (k). The higher the input clock frequency and the higher the division ratio (k),
the higher the accuracy.
2.
k: Set value of BRGC0
k
−
2
2k
21k + 2
2k
22k
21k + 2
×
FLmax = 11
×
FL
−
×
FL = FL
21k
−
2
20k
20k
21k
−
2
Содержание 78K0/KD1 Series
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