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| 型號： | KIT33298DWEVB |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 6/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT EVAL FOR MC33298 SMART SW |
| 標(biāo)準(zhǔn)包裝： | 1 |
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Analog Integrated Circuit Device Data
14
Freescale Semiconductor
33298
FUNCTIONAL DESCRIPTION
INTRODUCTION
ARCHIVE
INFORMATION
ARCHIVE
INFORMATION
Figure 14. 33298 SPI System Daisy Chain
One main advantage of the 33298 is the serial port. When
coupled to an MCU, it receives ON/OFF commands from the
MCU and in return transmits the drain status of the device’s
output switches. Many devices can be daisy-chained
together, forming a larger system, illustrated in Figure 14.
Note In this example, only one dedicated MCU parallel
port (aside from the required SPI) is required for chip select
to control 32 possible loads.
Multiple 33298 devices can also be controlled in a parallel
input fashion using the SPI, illustrated in Figure 15. This
figure shows a possible 24 loads being controlled by only
three dedicated parallel MCU ports used for chip select.
Figure 15. Parallel Input SPI Control
Figure 16 illustrates a basic method of controlling multiple
33298 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 33298 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 Freescale Semiconductor and other semiconductor
manufacturers. SPI reduces the number of pins necessary
for input/output (I/O) on the 33298. 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, Microcontroller Out Serial In (MOSI), and received
by another pin, Microcontroller In Serial Out (MISO), of
the MCU.
Some features of the SPI are:
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:
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
CS
SCLK
SI
33298
8 Outputs
A
B
C
Parallel
Ports
MC68XX
Microcontroller
SPI
SI
SCLK
CS
SI
SCLK
CS
SI
SCLK
CS
33298
SCLK
MOSI
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