
23
Serial data communication is synchronized with a clock signal. The SCI can communicate
with other chips having a clocked synchronous communication function. There is one serial
data communication format.
Data length: eight bits
Reception error detection: overrun errors
Full-duplex communication: Transmission and reception are independent, so the SCI can
transmit and receive simultaneously. Double buffering permits continuous data transfer in both
the transmit and receive directions.
On-chip baud-rate generator: Software selectable bit rates.
Internal or external transmit/receive clock source: Baud-rate generator (internal) or SCK input
signal (external).
Four types of interrupts: Transmit-data-empty, transmit-end, receive-data-full, and receive-
error interrupts. The transmit-data-empty and receive-data-full interrupts can start the transfer
of data by the direct memory access controller (DMAC).
Section 10 describes the SCI.
1.7.8
Serial I/O (SIO)
The serial I/O provides three ports for serial transmission and reception. The SIO has the
following features:
Full-duplex operation: Separate receive and transmit registers along with separate receive and
transmit clocks
Double-buffered receive and transmit ports: Allow continuous transmission and reception of
data
Transfer mode: Interval or continuous
Selectable data length: Byte or word
Four types of interrupts: Receive-data-full, transmit-data-empty, transmit-error and receive-
error interrupts. The transmit-data-empty and receive-data-full interrupts can start the transfer
of data by the direct memory access controller (DMAC).
Transfer order: Most-significant bit of I/O data transferred first
Section 11 describes the SIO.
1.7.9
Pin Function Controller (PFC)
The port pins (32 pins) are multiplexed for use as either general-purpose I/O pins or external pins
for the FRT, SCI, and SIO peripheral modules. The pin-function controller selects the function of
multiplexed pins and the direction of I/O. The configuration of pin function and I/O direction can
be selected for each pin individually.