Uart Baud Rate - Fujitsu F2MC-16LX Hardware Manual

CHAPTER 21 UART
21.6

UART Baud Rate

The sending and receiving clocks of UART has the following alternatives.
• Internal clock (reload counter)
• External clock (reload counter)
• External clock (clock input to SCK pin)
UART Baud Rate Selection
You can select one of the following three different baud rates:
Baud rate resulting from a dedicated baud rater generator of the internal clock.
The baud rate can be selected by setting the 11-bit reload value on settings of the UART prescaler control
registers 0 to 3 (UTCR0 to UTCR3), and the UART prescaler reload registers 0 to 3 (UTRLR0 to
UTRLR3). The reload counter divides the machine clock by the specified value. It is used in the
synchronous and asynchronous modes.
Baud rate resulting from a dedicated baud rater generator of the external clock.
The external clock is used as the clock source for the reload counter. The baud rate can be selected by
setting the 11-bit reload value on settings of the UART prescaler control registers 0 to 3 (UTCR0 to
UTCR3), and the UART prescaler reload registers 0 to 3 (UTRLR0 to UTRLR3). The reload counter
divides the external clock frequency by the set value. It is used in the asynchronous modes.
Baud rate of the external clock (one-to-one mode)
The clock that is entered from the UART clock input pins (SCK0 to SCK3) is used as the baud rate as it is.
It is used in the synchronous mode.
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