R01UH0823EJ0100 Rev.1.00
Page 963 of 1823
Jul 31, 2019
RX23W Group
33. 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 33.2.11, 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.
Event link function (supported by SCI5 only)
Error (receive error or error signal detection) event output
Receive data full event output
Transmit data empty event output
Transmit end event output
Table 33.2
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 33.4 to Table 33.7.
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 33.1
SCIg Specifications (2/2)
Item
Description