UPD70F3201 datasheet(42/98 Pages) NEC

Part #	UPD70F3201

Description	32-BIT SINGLE-CHIP MICROCONTROLLERS

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Manufacturer	NEC [NEC]

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Preliminary Product Information U15436EJ1V0PM

42

µµµµPD703201, 703201Y, 703204, 703204Y, 70F3201, 70F3201Y, 70F3204, 70F3204Y

12. SERIAL INTERFACE FUNCTION

The V850ES/SA2 and V850ES/SA3 include the following three types of serial interfaces.

Type

V850ES/SA2

V850ES/SA3

3-wire serial I/O

4 channels (CSI0 to CSI3)

5 channels (CSI0 to CSI4)

Asynchronous serial interface

2 channels (UART0, UART1)

I

2C busNote

1 channel (I

2C)Note

Note Available only in the

µPD703201Y, 703204Y, 70F3201Y, and 70F3204Y.

Some functions are used alternately as follows.

• CSI0/I2C

• CSI1/UART0

• CSI2

• UART1

• CSI3

• CSI4 (V850ES/SA3 only)

12.1 3-Wire Serial I/O (CSIn)

Remark In this section, the value of n is as follows.

n = 0 to 3 (V850ES/SA2)

n = 0 to 4 (V850ES/SA3)

The 3-wire serial I/O (CSIn) transfers data using following three lines.

• SCKn (serial clock)

• SOn (serial data output)

• SIn (serial data input)

The 3-wire serial I/O (CSIn) has the following features.

Transfer data length: Fixed to 8 bits

Transfer data MSB/LSB first can be switched

Transfer clock can be selected from eight clocks (seven master clocks, one slave clock)

Transmit/receive mode or receive-only mode can be specified

On-chip 8-bit transmit buffer

Transfer data transmit/receive timing with respect to the transfer clock can be changed

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