Baud Rate By Internal Timer (16-Bit Reload Timer) - Fujitsu MB90895 Series Hardware Manual

CHAPTER 14 UART0
14.5.2

Baud Rate by Internal Timer (16-bit Reload Timer)

The setting when selecting the internal clock supplied from the 16-bit reload timer 1 as
the clock input source of the UART0 and the baud rate calculation are shown below.
I Baud Rate by Internal Timer (16-bit Reload Timer Output)
The baud rate based on the internal timer (16-bit reload timer 0 output) is set by setting the clock input
source select bits (SMR0: CS2 to CS0) to "110
the count clock and the reload value of the 16-bit reload timer.
Figure 14.5-3 shows the baud rate selector based on the internal timer.
• If the internal timer (16-bit reload timer) is selected as a clock input source (SMR0: CS2 to CS0), the 16-bit
reload timer output pin (TOT) is connected internally and does not need to be connected externally to the
external clock input pin (SCK0).
• The 16-bit reload timer output pin (TOT) can be used as a general-purpose I/O port when it is not being
used in other way.
Figure 14.5-3 Baud Rate Selector by Internal Timer (16-bit Reload Timer Output)
16-vit reload timer 0 output
(Specifying frequency count clock
dividing ratio and reload value)
410
".Any baud rate can be set by selecting the division ratio of
B
SMR0: CS2 to CS0 = "110
(Clock input source select bit)
Clock selector
1/2 [Clock sync]
1/32 [Asynchronous]
SMR0: MD1, MD0
(Operating mode select bit)
"
B
Baud rate