upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 249

• Manufacturer Part Number: upd78f0730
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

(a) Baud rate
(b) Error of baud rate
The baud rate can be calculated by the following expression.
• Baud rate =
f
k:
The baud rate error can be calculated by the following expression.
• Error (%) =
Cautions 1. Keep the baud rate error during transmission to within the permissible error range at
XCLK6
Example: Frequency of base clock = 16 MHz = 16,000,000 Hz
: Frequency of base clock selected by TPS63 to TPS60 bits of CKSR6 register
Value set by MDL67 to MDL60 bits of BRGC6 register (k = 4, 5, 6, ..., 255)
2. Make sure that the baud rate error during reception satisfies the range shown in (4)
f
the reception destination.
Permissible baud rate range during reception.
2 × k
XCLK6
Set value of MDL67 to MDL60 bits of BRGC6 register = 01000101B (k = 69)
Target baud rate = 115200 bps
Baud rate = 16 M/(2 × 69)
Error = (115942/115200 − 1) × 100
Actual baud rate (baud rate with error)
Desired baud rate (correct baud rate)
= 0.644 [%]
[bps]
= 16000000/(2 × 69) = 115942 [bps]
CHAPTER 10 SERIAL INTERFACE UART6
Preliminary User’s Manual U19014EJ1V0UD
− 1 × 100 [%]
249