UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 425

• Manufacturer Part Number: UPD78F0838
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

Therefore, the maximum receivable baud rate at the transmission destination is as follows.
Similarly, the maximum permissible data frame length can be calculated as follows.
Therefore, the minimum receivable baud rate at the transmission destination is as follows.
The permissible baud rate error between UART60 and UART61 and the transmission destination can be
calculated from the above minimum and maximum baud rate expressions, as follows.
Remarks 1. The permissible error of reception depends on the number of bits in one frame, input clock
10
11
Minimum permissible data frame length: FLmin = 11
FLmax = 11
FLmax =
Division Ratio (k)
4
8
20
50
100
255
BRmax = (FLmin/11)
BRmin = (FLmax/11)
2. k: Set value of BRGC6n (n = 0, 1)
frequency, and division ratio (k). The higher the input clock frequency and the higher the
division ratio (k), the higher the permissible error.
21k – 2
20k
FL
Table 12-5. Maximum/Minimum Permissible Baud Rate Error
CHAPTER 12 SERIAL INTERFACES UART60 AND UART61
FL
k + 2
2
Maximum Permissible Baud Rate Error
k
11
1
1
=
=
FL =
21k + 2
21k
22k
Preliminary User’s Manual U19748EJ1V0UD
20k
21k
2
+2.33%
+3.53%
+4.26%
+4.56%
+4.66%
+4.72%
2
Brate
Brate
k
2
FL
FL
k
2k
Minimum Permissible Baud Rate Error
2
FL =
21k + 2
2k
2.44%
3.61%
4.31%
4.58%
4.67%
4.73%
FL
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