Maxim Integrated MAXQ7667 - Manual (Page 165)

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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 MOSI
SPI SLAVE
#1
SPI SLAVE
#2
MISO
SCLK
SS
MOSI
MISO
SCLK
SS
MISO
SPI MASTER SCLK
SS
(GPIOn) SS