TMPR3911 datasheet(301/462 Pages) TOSHIBA

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Chapter 14 SPI Module

14-1

14. SPI Module

14.1 Overview

The SPI is a serial interface consisting of clock, data out, and data in. The SPI is used to interface to

devices such as serial power supplies, serial A/D converters, and other devices that contain simple serial

clock and data interfaces. The TMPR3911/12 only supports master mode and generates the SPI clock to the

slaves. Multiple slave devices can share the SPI by using a unique chip select for each slave device. The chip

select can be generated using one of the general purpose I/O ports on the TMPR3911/12 or TC35143, or

using some other output port available in the system. When a device is selected by asserting it’s chip select,

the device will shift data in using the SPICLK and SPIOUT signals and the device will shift data out using

the SPIIN signal. When a device is not selected then the data output connected to SPIIN must be tri-stated so

other devices can share the SPIIN signal. The SPI Module contains registers which provide programmability

for SPICLK rate, MSB first versus LSB first, clock polarity, data phase polarity, and byte mode versus word

mode operation.

14.1.1

Related Pins

SPICLK:

OUTPUT

This pin is used to clock data in and out of the slave device.

SPIOUT:

OUTPUT

This pin contains the data that is shifted into the slave device.

SPIIN:

INPUT

This pin contains the data that is shifted out of the slave device.

TMPR3911 Datasheet(PDF) 301 Page - Toshiba Semiconductor