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Chapter 13
Serial Interface Function
Preliminary User’s Manual U15839EE1V0UM00
(12) Clocked serial interface initial transmission buffer registers Low (SOTBFL0 to SOTBFL2)
The SOTBFLn register is an 8-bit buffer register that stores initial transmit data in the repeat
transfer mode.
(13) Selector
The selector selects the serial clock to be used.
(14) Serial clock control circuit
Controls the serial clock supply to the shift register. Also controls the clock output to the SCK0n
pin when the internal clock is used.
(15) Serial clock counter
Counts the serial clock output or input during transmission/reception operation, and checks
whether 8-bit data transmission/reception has been performed.
(16) Interrupt control circuit
Controls the interrupt request timing.
Figure 13-21:
Block Diagram of Clocked Serial Interfaces
Remark:
n = 0 to 2
Selector
Transmission control
SO selection
SO latch
Transmit
data buffer register
(SOTBn/SOTBLn)
Receive data buffer register
(SIRBn/SIRBLn)
Shift register
(SIOn/SIOLn)
Initial transmit
data buffer register
(SOTBFn/SOTBFLn)
Interrupt
control
circuit
Clock start/stop control
&
clock phase control
Serial clock control circuit
SCK0n
INTCSI0n
SO0n
SI0n
Control signal
Transmission data control
SCK0n
/4
f
PCLK
BRG1
BRG0
/8
f
PCLK
/16
f
PCLK
/32
f
PCLK
/64
f
PCLK
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