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13.1 Serial Interface Functions
The serial interface UART has the following two modes.
(1) Operation stop mode
This mode is used when serial transfers are not performed to reduce power consumption.
For details, see 13.4.1 Operation stop mode.
(2) Asynchronous serial interface (UART) mode
This mode enables full-duplex operation wherein one byte of data is transmitted and received after the start bit.
The on-chip dedicated UART baud rate generator enables communications using a wide range of selectable baud
rates.
For details, see 13.4.2 Asynchronous serial interface (UART) mode.
Figure 13-1 shows the serial interface UART block diagram.
Receive buffer
register (RXB)
Direction controller
Receive shift
RxD/P53
register (RXS)
TxD/P54
Receive controller
TXE RXE PS1 PS0 CL
CHAPTER 13 SERIAL INTERFACE UART
Figure 13-1. Serial Interface UART Block Diagram
Internal bus
Asynchronous serial interface
status register (ASIS)
PE
FE
3
INTSER
INTSR
SL ISRM
Asynchronous serial interface mode register (ASIM)
Internal bus
Preliminary User's Manual U14581EJ3V0UM00
Direction controller
OVE
Transmit shift
register (TXS)
TXE
Transmit controller
Baud rate generator
3
TPS2 TPS1 TPS0 MDL3 MDL2 MDL1 MDL0
Baud rate generator control register (BRGC)
INTST
f
/2
X
2
f
/2
X
3
f
/2
f
X
SCK
4
f
/2
X
5
f
/2
X
6
f
/2
X
7
f
/2
X
8
f
/2
X
4
169
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