Fujitsu 8FX - CHAPTER 24 I2 C BUS INTERFACE

MB95630H Series
MN702-00009-2v0-E FUJITSU SEMICONDUCTOR LIMITED 471
CHAPTER 22 UART/SIO
22.6 Operations and Setting Procedure Example
Figure 22.6-10 Baud Rate Calculation Formula for Using Dedicated Baud Rate Generator
● Serial clock
The serial clock signal is output under control of the output for transmit data. When only
reception is performed, therefore, set transmission control (SMC2n:TXE = 1) to write dummy
transmit data to the UART/SIO serial output register. Refer to the device data sheet for the
UCKn clock value.
Baud rate value =
Machine clock (MCLK)
[bps]
2
×
×
1
2
4
8
1
:
256
UART baud rate setting register ch. n (BRSRn)
Baud rate setting (BRS[7:0])
UART prescaler select register ch. n (PSSRn)
Prescaler select (PSS[1:0])