EZ80F91MCU ZILOG [Zilog, Inc.], EZ80F91MCU Datasheet - Page 228

• Manufacturer Part Number: EZ80F91MCU
• Description: eZ80Acclaim-TM Flash Microcontrollers
• Manufacturer: ZILOG [Zilog, Inc.]

Serial Peripheral Interface
PS019209-0504
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 mas-
ter and the slave SPI devices.
In a serial peripheral interface, separate signals are required for data and clock.
The SPI can 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 dem-
onstrated in Figures 39 and 40 .
Figure 39. SPI Master Device
Figure 40. SPI Slave Device
ENABLE
DATAIN
DATAIN
CLKIN
SS
MISO
SS
MOSI
SCK
Bit 0
Bit 0
P R E L I M I N A R Y
Baud Rate
Generator
8-Bit Shift Register
8-Bit Shift Register
MASTER
SLAVE
Bit 7
Bit 7
MISO
SCK
DATAOUT
CLKOUT
DATAOUT
Product Specification
Serial Peripheral Interface
eZ80F91 MCU
209