Operating Description Of Operation Mode 1 - Fujitsu F2MC-8FX Hardware Manual

20.7.2

Operating Description of Operation Mode 1

Operation mode 1 operates in synchronous clock mode.
Operating Description of UART/SIO Operation Mode 1
Setting the MD bit in UART/SIO serial mode control register 1 (SCM10) to 1 selects synchronous clock
mode (SIO).
The character bit length in synchronous clock mode (SIO) is variable between 5 and 8 bits.
Note, however, that parity is disabled and no stop bit is used.
The serial clock is selected by the CKS bit in the SMC10 register. Select the dedicated baud rate generator
or external clock. The SIO performs shift operation using the selected serial clock as a shift clock.
To input the external clock signal, set the SCKE bit to "0".
To output the dedicated baud rate generator output as a shift clock signal, set the SCKE bit to "1". The
serial clock signal is obtained by dividing clock by two, which is supplied by the dedicated baud rate
generator. The baud rate in the SIO mode can be set in the following range. (For more information about
the dedicated baud rate generator, also refer to "CHAPTER 21 UART/SIO DEDICATED BAUD RATE
GENERATOR")
Table 20.7-4 Baud Rate Setting Range in SIO Mode
The baud rate applied when the external clock or dedicated baud rate generator is used is obtained from the
corresponding equation illustrated below.
PSS[1:0]
0, 0 to 1, 1
Figure 20.7-9 Calculating Baud Rate Based on External Clock
Baud rate value =
*: External clock
01h(1) to FFh(255), 00h(256)
(The highest and lowest baud rate settings are 01
1
[bps]
External clock*
More than 4 machine clock
More than 4 machine clock
CHAPTER 20 UART/SIO
BRS[7:0]
and 00 , respectively.)
H H
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