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uPD780065 Subseries PUM - Renesas Electronics

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13.1 Serial Interface (UART0) Functions<br />

CHAPTER 13 SERIAL INTERFACE (UART0)<br />

The serial interface (UART0) has the following three modes.<br />

(1) Operation stop mode<br />

This mode is used when serial transfers are not performed to reduce power consumption.<br />

For details, see 13.4.1 Operation stop mode.<br />

(2) Asynchronous serial interface (UART) mode<br />

This mode enables full-duplex operation wherein one byte of data after the start bit is transmitted and received.<br />

The on-chip baud rate generator dedicated to UART enables communications using a wide range of selectable<br />

baud rates. In addition, a baud rate can also be defined by dividing clocks input to the ASCK0 pin.<br />

The UART baud rate generator can also be used to generate a MIDI-standard baud rate (31.25 kbps).<br />

For details, see 13.4.2 Asynchronous serial interface (UART) mode.<br />

(3) Infrared data transfer mode<br />

For details, see 13.4.3 Infrared data transfer mode.<br />

RxD0/P73<br />

TxD0/P72<br />

Figure 13-1 shows a block diagram of the serial interface (UART0) macro.<br />

Receive<br />

buffer<br />

register<br />

(RXB0)<br />

Receive<br />

shift<br />

register<br />

(RX0)<br />

Receive<br />

controller<br />

(parity<br />

check)<br />

Figure 13-1. Serial Interface (UART0) Block Diagram<br />

PE0 FE0 OVE0<br />

INTSR0<br />

Asynchronous<br />

serial interface<br />

status register<br />

(ASIS0)<br />

Internal bus<br />

INTSER0<br />

Transmit<br />

shift<br />

register<br />

(TXS0)<br />

Transmit<br />

controller<br />

(parity<br />

addition)<br />

INTST0<br />

Preliminary User’s Manual U13420EJ2V0UM00<br />

TXE0 RXE0 PS01 PS00 CL0 SL0 ISRM0 IRDAM0<br />

Baud rate<br />

generator<br />

Asynchronous serial interface<br />

mode register (ASIM0)<br />

ASCK0/P71<br />

fX/2 to fX/2 7<br />

187

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