UPD70741 datasheet(39/114 Pages) RENESAS

39 / 114 page

µPD70741

8. SERIAL INTERFACE FUNCTION

8.1 Features

The V821 provides two transmission and reception channels as part of its serial interface function.

The two interface modes listed below are supported, one channel being provided for each mode. The two modes

operate independently of each other.

(1) Asynchronous serial interface (UART)

(2) Synchronous serial interface (CSI)

In UART mode, one-byte serial data is transmitted or received after a start bit, and full-duplex communication is

enabled.

In CSI mode, data is transferred using three signal lines (three-wire serial I/O): the serial clock (SCLK), serial input

(SI), and serial output (SO).

8.2 Asynchronous Serial Interface (UART)

8.2.1 Features

Transfer rate 110 bps to 38 400 bps

(when BRG is used with

φ = 25 MHz)

781 Kbps maximum

(when

φ/2 is used with φ = 25 MHz)

Full-duplex communication

Two-pin configuration TXD : Transmission data output pin

RXD : Reception data input pin

Reception error detection function

• Parity error

• Framing error

• Overrun error

Interrupt source (3 types)

• Reception error interrupt (INTSER)

• Reception completion interrupt (INTSR)

• Transmission completion interrupt (INTST)

The character length for transmission and reception data is specified upon ASIM reception.

Character length : 7 or 8 bits

9 bits (when an extended bit is used)

Parity function: Odd parity, even parity, zero parity, without parity

Transmission stop bit: 1 or 2 bits

On-chip baud rate generator

UPD70741 Datasheet(PDF) 39 Page - Renesas Technology Corp