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16.1 Serial Interface (SIO31) Functions
The serial interface (SIO31) has the following two modes.
(1) Operation stop mode
This mode is used when serial transfers are not performed. For details, see 16.4.1 Operation stop mode.
(2) 3-wire serial I/O mode (fixed as MSB first)
This is an 8-bit data transfer mode using three lines: a serial clock line (SCK31), serial output line (SO31), and
serial input line (SI31).
Since simultaneous transmit and receive operations are enabled in 3-wire serial I/O mode, the processing time
for data transfers is reduced.
The first bit of the serial transferred 8-bit data is fixed as the MSB.
3-wire serial I/O mode is useful for connection to a peripheral I/O incorporating a clock-synchronous serial
interface, or a display controller, etc. For details see 16.4.2 3-wire serial I/O mode.
Figure 16-1 shows a block diagram of the serial interface (SIO31).
SI31/P92
SO31/P91
SCK31/P90
CHAPTER 16 SERIAL INTERFACE (SIO31)
Figure 16-1. Serial Interface (SIO31) Block Diagram
Preliminary User's Manual U13420EJ2V0UM00
Internal bus
8
Serial I/O shift register
31 (SIO31)
Interrupt
Serial clock
request signal
counter
generator
Serial clock
control circuit
INTCSI31
3
f
/2
X
Selector
4
f
/2
X
5
f
/2
X
257
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