EZ80L92MCU Datasheet, PDF (142/241 Pages) Zilog, Inc. – eZ80Acclaim Flash Microcontrollers

eZ80L92 MCU
Product Specification
127
Serial Peripheral Interface
The Serial Peripheral Interface (SPI) is a synchronous interface allowing several SPI-type
devices to be interconnected. The SPI is a full-duplex, synchronous, character-oriented
communication channel that employs a four-wire interface. The SPI block consists of a
transmitter, receiver, baud rate generator, and control unit. During an SPI transfer, data is
sent and received simultaneously by both the master and the slave SPI devices.
In a serial peripheral interface, separate signals are required for data and clock. The SPI
may be configured as either a master or a slave. The connection of two SPI devices (one
master and one slave) and the direction of data transfer is demonstrated in Figures 27 and
28 .
DATAIN
SS
MISO
MASTER
Bit 0
Bit 7
8-Bit Shift Register
SCK
DATAOUT
CLKOUT
Baud Rate
Generator
Figure 27. SPI Master Device
ENABLE
DATAIN
CLKIN
SS
MOSI
SCK
SLAVE
Bit 0
Bit 7
8-Bit Shift Register
Figure 28. SPI Slave Device
MISO
DATAOUT
PS013012-1004
PRELIMINARY
Serial Peripheral Interface