Fujitsu 8FX Hardware Manual page 239

MB95630H Series
■ External Clock
The external clock is selected by writing "1" to the EXT bit in the LIN-UART serial mode
register (SMR). In the baud rate generator, the external clock can be used in the same way as
the internal clock.
When slave operation is used in operating mode 2 (synchronous), select the one-to-one external
clock input mode (SMR:OTO = 1). In this mode, the external clock input to SCK is input
directly to the LIN-UART serial clock.
Note:
The external clock signal is synchronized with the internal clock (MCLK: machine clock) in
the LIN-UART. Therefore, if the external clock becomes not divisible because its cycle is
faster than half the cycle of the internal clock, the external clock signal becomes unstable.
For the value of the SCK clock, refer to the data sheet of this microcontroller.
MN702-00009-2v0-E FUJITSU SEMICONDUCTOR LIMITED
CHAPTER 14 LIN-UART
14.5 LIN-UART Baud Rate
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