參數(shù)資料
型號(hào)： MCZ33291LEG
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述： Eight-Output Switch with Serial Peripheral Interface I/O
中文描述： 8輸出開關(guān)串行外設(shè)接口的I / O
文件頁(yè)數(shù)： 12/25頁(yè)
文件大小： 389K
代理商： MCZ33291LEG
Analog Integrated Circuit Device Data
Freescale Semiconductor
12
33291L
FUNCTIONAL DESCRIPTION
INTRODUCTION
Figure 13. 33291L SPI System Daisy Chain
Multiple 33291L devices can also be controlled in a
parallel input fashion using SPI, illustrated in
Figure 14
. This
figure shows a possible 24 loads being controlled by only
three dedicated parallel MCU ports used for chip select.
Figure 14. Parallel Input SPI Control
Figure 15
, page
13
, illustrates a basic method of
controlling multiple 33291L devices using two MCUs. A
system can have only one master MCU at any given instant
of time and one or more slave MCUs. Master control of the
system must pass from one MCU to the other in an orderly
manner. The master MCU supplies the system clock signal
(top MCU designated the master); the lower MCU being the
slave. It is possible to have a system with more than one
master; however, not at the same time. Only when the master
is not communicating can a slave assume the
mastership
and
communicate. MCU master control is switched through the
use of the slave select (
SS
) pin of the MCUs. A master will
become a slave when it detects a logic low state on its
SS
pin.
These basic examples make the 33291L very attractive for
applications where a large number of loads require efficient
control. To this end, the popular Synchronous Serial
Peripheral Interface (SPI) protocol is incorporated to
communicate efficiently with the MCU.
SPI SYSTEM ATTRIBUTES
The SPI system is flexible enough to communicate directly
with numerous standard peripherals and MCUs available
from Motorola and other semiconductor manufacturers. SPI
reduces the number of pins necessary for input/output (I/O)
on the 33291L. It also offers an easy means of expanding the
I/O function using few MCU pins. The SPI system of
communication consists of the MCU transmitting, in return it
receives one data-bit of information per system clock cycle.
Data bits of information are simultaneously transmitted by
one pin, Master Out Serial In (MOSI), and received by
another pin, Master In Serial Out (MISO), of the MCU.
Some features of SPI are as follows:
Full duplex, three-wire synchronous data transfer
Each microcontroller can be a master or a slave
Provides write collision flag protection
Provides end of message interrupt flag
Four I/Os associated with SPI (MOSI, MISO, SCLK, SS)
Drawbacks to SPI are as follows:
An MCU is required for efficient operational control
In contrast to parallel input control it is slower at performing
pulse width modulating (PWM) functions.
SCLK
Parallel Port
MISO
MOSI
IRQ
MC68XX
Microcontroller
SPI
SO
SO
SO
SO
CS
CS
CS
CS
SCLK
SCLK
SCLK
SCLK
SI
SI
SI
SI
33291
33291
33291
33291
8 Outputs
8 Outputs
8 Outputs
8 Outputs
8 Outputs
8 Outputs
8 Outputs
A0
A1
A2
Parallel
Ports
MC68XX
Microcontroller
SPI
SI
SCLK
CS
SI
SCLK
CS
SI
SCLK
CS
33291
33291
33291
SCLK
MOSI
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