CHAPTER 11 SERIAL INTERFACE FUNCTION
User’s Manual U15109EJ3V0UD
434
11.6 Asynchronous Serial Interface (UART0 to UART3)
UARTn (n = 0 to 3) has the following two operation modes.
(1) Operation stop mode
In this mode, serial transfers are not performed, thus enabling a reduction in power consumption.
(2) Asynchronous serial interface mode
This mode enables full-duplex operation in which one byte of data after the start bit is transmitted and received.
The on-chip dedicated UARTn baud rate generator enables communications using a wide range of selectable
baud rates. In addition, a baud rate based on divided-clock input to the ASCKn pin can also be defined.
The UARTn baud rate generator can also be used to generate a MIDI-standard baud rate (31.25 Kbps).
11.6.1 Configuration
The UARTn includes the following hardware.
Table 11-12. Configuration of UARTn
Item
Configuration
Registers
Transmit shift registers 0 to 3 (TXS0 to TXS3)
Receive buffer registers 0 to 3 (RXB0 to RXB3)
Control registers
Asynchronous serial interface mode registers 0 to 3 (ASIM0 to ASIM3)
Asynchronous serial interface status registers 0 to 3 (ASIS0 to ASIS3)
Baud rate generator control registers 0 to 3 (BRGC0 to BRGC3)
Baud rate generator mode control registers 00 to 03 (BRGMC00 to BRGMC03)
Baud rate generator mode control registers 10 to 13 (BRGMC10 to BRGMC13)