Maxim-integrated MAXQ7667 Manual de usuario descargar pdf (Pagina 165)

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9-3 ___________________________________________________________________________________________________________

MAXQ7667 User’s Guide

SECTION 9: ENHANCED SERIAL PERIPHERAL INTERFACE (SPI) MODULE

The MAXQ7667 has a powerful hardware serial peripheral interface (SPI) module that allows for serial communication with a variety of

external devices. The SPI port on the MAXQ is a fully independent module that can be accessed under program control. This module

supports access to the full 4-wire, full-duplex serial bus, and can be operated in either master mode or slave mode. The enhanced SPI

provides the ability to select the state of the slave select in slave mode.

The SPI bus is typically implemented with one master device and multiple slave devices. Each slave device has a unique SS pin that

is used to enable transfers to that device. Figure 9-1 shows a typical SPI bus configuration. Auxiliary digital I/O pins are used as addi-

tional SS.

Figure 9-1. SPI Bus Configuration

MOSI

SPI SLAVE

MISO

SCLK

MOSI

MISO

SCLK

MISO

SPI MASTER

SCLK

(GPIOn) SS

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Maxim-integrated MAXQ7667 Manual de usuario Pagina 165

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