UPD17708 datasheet(218/358 Pages) RENESAS

218 / 358 page

216

µPD17704, 17705, 17707, 17708, 17709

16. SERIAL INTERFACES

16.1 Outline of Serial Interfaces

Figure 16-1 outlines the serial interfaces.

Table 16-1 classifies the serial interfaces and shows their communication modes.

As shown in Figure 16-1, two serial interfaces, 0 (SIO0) and 1 (SIO1), are available.

Serial interfaces 0 and 1 can be used at the same time.

Serial interface 0 can be used in two modes: 2-wire and 3-wire modes. In the 2-wire mode, two pins, SDA and

SCL, are used. In the 3-wire mode, three pins, SCK0, SO0, and SI0, are used.

In the 2-wire mode, two communication modes, I2C bus and serial I/O modes, can be selected.

Serial interface 1 can be used only in 3-wire mode, and uses three pins, SCK1, SO1, and SI1. The communication

mode is the serial I/O mode.

Figure 16-1. Outline of Serial Interfaces

Serial interface 0

4.5 MHz

Presettable shift register 0

(SIO0SFR)

Clock control block

SDA/P0A3

SCL/P0A2

SCK0/P0A1

SO0/P0A0

SI0/P0B3

Interrupt control block

IRQSIO0 flag

Serial interface 1

4.5 MHz

Presettable shift register 1

(SIO1SFR)

Clock control block

SCK1/P0B2

SO1/P0B1

SI1/P0B0

IRQSIO1 flag

UPD17708 Datasheet(PDF) 218 Page - Renesas Technology Corp