z8fmc16100 ZiLOG Semiconductor, z8fmc16100 Datasheet - Page 161
z8fmc16100
Manufacturer Part Number
z8fmc16100
Description
Z8 Encore Motor Control Flash Mcus
Manufacturer
ZiLOG Semiconductor
Datasheet
1.Z8FMC16100.pdf
(381 pages)
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PS024611-0408
Operation
SPI Signals
The SPI is a full-duplex, synchronous, character-oriented channel that supports a four-wire
interface (serial clock, transmit, receive, and slave select). The SPI block consists of a
transmit/receive shift register, a Baud Rate (clock) Generator, and a control unit.
During an SPI transfer, data is sent and received simultaneously by both the master and the
slave SPI devices. Separate signals are required for data and the serial clock. When an SPI
transfer occurs, a multibit (typically 8-bit) character is shifted out one data pin and an
multibit character is simultaneously shifted in on a second data pin. An 8-bit shift register
in the master and another 8-bit shift register in the slave are connected as a circular buffer.
The SPI shift register is single-buffered in the transmit and receive directions. New data to
be transmitted cannot be written into the shift register until the previous transmission is
complete and receive data (if valid) has been read.
The four basic SPI signals are:
•
•
•
•
Each signal is described in both MASTER and SLAVE modes.
Master-In/Slave-Out
The Master-In/Slave-Out (MISO) pin is configured as an input in a master device and as an
output in a slave device. It is one of the two lines that transfer serial data, with the most sig-
nificant bit sent first. The MISO pin of a slave device is placed in a high-impedance state if
the slave is not selected. When the SPI is not enabled, this signal is in a high-impedance
state.
Master-Out/Slave-In
The Master-Out/Slave-In (MOSI) pin is configured as an output in a master device and as
an input in a slave device. It is one of the two lines that transfer serial data, with the most
significant bit sent first. When the SPI is not enabled, this signal is in a high-impedance
state.
Serial Clock
The Serial Clock (SCK) synchronizes data movement both in and out of the device through
its MOSI and MISO pins. In MASTER mode, the SPI’s Baud Rate Generator creates the
Master-In/Slave-Out (MISO)
Master-Out/Slave-In (MOSI)
Serial Clock (SCK)
Slave Select (SS)
Z8FMC16100 Series Flash MCU
Product Specification
Operation
149
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