CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U15195EJ5V0UD
477
Figure 10-26. Block Diagram of Clocked Serial Interface
Selector
Transmission control
SO selection
SO latch
Transmit
buffer register
(SOTBn/SOTBLn)
Receive buffer register
(SIRBn/SIRBLn)
Shift register
(SIOn/SIOLn)
Initial transmit
buffer register
(SOTBFn/SOTBFLn)
Interrupt
controller
Clock start/stop control
&
clock phase control
Serial clock controller
SCKn
INTCSIn
SOn
SIn
Control signal
Transmission data control
f
XX
/2
7
f
XX
/2
6
f
XX
/2
5
f
XX
/2
4
f
XX
/2
3
f
XX
/2
2
BRG3
SCKn
Remarks 1.
n = 0, 1
2.
f
XX
: Internal system clock
3.
The SO1, SI1, and SCK1 pins function alternately as the TXD1, RXD1, and ASCK1 pins.