UPD703003 datasheet(24/82 Pages) NEC

24 / 82 page

µPD703003

Data Sheet U12261EJ2V1DS00

9. SERIAL INTERFACE FUNCTIONS (SIO)

Two types and six channels of serial interfaces are provided.

Up to four channels may be used at the same time.

(1) Asynchronous serial interfaces 0, 1 (UART0, UART1): 2 channels

(2) Clock-synchronized serial interfaces 0 to 3 (CSI0 to CSI3): 4 channels

Caution

UART0 and CSI0 are a shared pin, as are UART1 and CSI1. Either one can be selected via a

9.1 Asynchronous Serial Interfaces 0, 1 (UART0, UART1)

The features of the asynchronous serial interfaces 0, 1 (UART0, UART1) are shown below.

• Transfer rate

150 bps to 76800 bps (@

φ = 33-MHz operation, using baud rate generator)

110 bps to 307200 bps (@

φ = 20-MHz operation, using baud rate generator)

Maximum 1031 Kbytes (@

φ = 33-MHz operation, using φ/2)

• Full duplex communications: Receive buffer (RXBn) included

• Two-pin configuration

TXDn: output pin for transmit data

RXDn: input pin for receive data

• Reception error detection function

• Parity error

• Framing error

• Overrun error

• Three types of interrupt sources

• Reception error interrupt (INTSERn)

• Reception completion interrupt (INTSRn)

• Transmission completion interrupt (INTSTn)

• The character length of transmit and receive data is specified via the ASIMn0, ASIMn1 register

• Character lengths: 7 or 8 bits, or 9 bits (if using expansion bit)

• Parity function: even, odd, zero, or no parity

• Transmission stop bits: 1 or 2 bits

• On-chip baud rate generator

Remark n = 0, 1

φ : internal system clock

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