R01UH0822EJ0100 Rev.1.00
Page 583 of 1041
Jul 31, 2019
RX13T Group
23. Serial Communications Interface (SCIg, SCIh)
Note 1. In simple I
2
C mode, only MSB first is available.
Clock synchronous
mode
Data length
8 bits
Receive error detection
Overrun error
Hardware flow control
CTSn# and RTSn# pins can be used in controlling transmission/reception.
Smart card interface
mode
Error processing
An error signal can be automatically transmitted when detecting a parity error during
reception
Data can be automatically retransmitted when receiving an error signal during
transmission
Data type
Both direct convention and inverse convention are supported.
Simple I
2
C mode
Transfer format
I
2
C-bus format
Operating mode
Master (single-master operation only)
Transfer rate
Fast mode is supported (refer to section 23.2.11, Bit Rate Register (BRR) to set the
transfer rate).
Noise cancellation
The signal paths from input on the SSCLn and SSDAn pins incorporate digital noise
filters, and the interval for noise cancellation is adjustable.
Simple SPI bus
Data length
8 bits
Detection of errors
Overrun error
SS input pin function
Applying the high level to the SSn# pin can cause the output pins to enter the
high-impedance state.
Clock settings
Four kinds of settings for clock phase and clock polarity are selectable.
Bit rate modulation function
Correction of outputs from the on-chip baud rate generator can reduce errors.
Table 23.2
SCIh Specifications (1/2)
Item
Description
Serial communication modes
Asynchronous
Clock synchronous
Smart card interface
Simple I
2
C-bus
Simple SPI bus
Transfer speed
Bit rate specifiable with the on-chip baud rate generator.
Full-duplex communications
Transmitter: Continuous transmission possible using double-buffer structure.
Receiver: Continuous reception possible using double-buffer structure.
I/O pins
Refer to Table 23.4 to Table 23.7.
Data transfer
Selectable as LSB first or MSB first transfer*
Interrupt sources
Transmit end, transmit data empty, receive data full, and receive error
Completion of generation of a start condition, restart condition, or stop condition (for simple
I
2
C mode)
Low power consumption function
Module stop state can be set.
Table 23.1
SCIg Specifications (2/2)
Item
Description