R01UH0822EJ0100 Rev.1.00
Page 584 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.
Asynchronous
mode
Data length
7, 8, or 9 bits
Transmission stop bit
1 or 2 bits
Parity
Even parity, odd parity, or no parity
Receive error detection
Parity, overrun, and framing errors
Hardware flow control
CTSn# and RTSn# pins can be used in controlling transmission/reception.
Start-bit detection
Low level or falling edge is selectable.
Break detection
When a framing error occurs, a break can be detected by reading the RXDn pin level
directly.
Clock source
An internal or external clock can be selected.
Transfer rate clock input from the MTU can be used.
Double-speed mode
Baud rate generator double-speed mode is selectable.
Multi-processor
communications function
Serial communication among multiple processors
Noise cancellation
The signal paths from input on the RXDn pins incorporate digital noise filters.
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.
Extended
serial mode
Start Frame transmission
Output of a low level as the Break Field over a specified width and generation of
interrupts on completion
Detection of bus collisions and the generation of interrupts on detection
Start Frame reception
Detection of the Break Field low width and generation of an interrupt on detection
Comparison of Control Fields 0 and 1 and generation of an interrupt when the two match
Two kinds of data for comparison (primary and secondary) can be set in Control Field 1.
A priority interrupt bit can be set in Control Field 1.
Handling of Start Frames that do not include a Break Field
Handling of Start Frames that do not include a Control Field 0
Function for measuring bit rates
I/O control function
Selectable polarity for TXDX12 and RXDX12 signals
Selection of a digital filter for the RXDX12 signal
Half-duplex operation employing RXDX12 and TXDX12 signals multiplexed on the same
pin
Selectable timing for the sampling of data received through RXDX12
Timer function
Usable as a reloading timer
Bit rate modulation function
Correction of outputs from the on-chip baud rate generator can reduce errors.
Table 23.2
SCIh Specifications (2/2)
Item
Description