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參數(shù)資料
| 型號(hào)： | MC68HC55CD |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4 CHANNEL(S), SERIAL COMM CONTROLLER, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數(shù)： | 34/40頁 |
| 文件大?。?/td> | 284K |
| 代理商： | MC68HC55CD |
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MC68HC55 Technical Data
Technical Data
MC68HC55
4
DSI/D (Distributed System Interface – Digital)
Figure 1-1. DSI System Connections
(Other Arrangements Possible)
After reset, the master MCU must first configure the DSI system by
assigning a unique 4-bit address to each remote peripheral unit on the
2-wire DSI bus. When the system is initially powered up, the 2-wire bus
idles at about 25 volts to provide power to the local power supply
capacitor at the first node of the distributed bus. A bus switch in each
peripheral node is initially opened until that node has been programmed
with a 4-bit address. After power up, the 2-wire bus only goes as far as
the first node. The master MCU provides a series of SPI commands to
the DSI/D to send a 16-bit (plus 4-bit CRC) message instructing it to
assign a 4-bit address to the first node. Address 0000 is a global address
which addresses all nodes whether or not they have been initialized with
their unique 4-bit address. During this first message, no remote node will
respond (provide return data to the master). This first message sets the
address of the first node, which causes it to close its bus switch.The bus
now goes to the first and second nodes along the 2-wire bus, and the
second node power supply capacitor becomes charged by the 25-volt
idle level on the bus.
MC68HC16P3
MCU
SCK
MOSI
MISO
I/O Pin
PWM Pin
SPI
(Master)
MC68HC55
DSI0F
DSI0S
DSI0R
CLK
DI
DO
CS
SCLK
DSI/P
DSI1F
DSI1S
DSI1R
CH.
0
CH.
1
CSU - CENTRAL SENSING UNIT
DSI0O
GND
SIGNAL
GND
2-WIRE BUS
B
US
IN
GND
RETURN
B
US
OUT
SLAVE 1
B
US
IN
GND
B
US
OUT
SLAVE 2
B
US
IN
GND
B
US
OUT
SLAVE 3
B
US
IN
GND
B
US
OUT
SLAVE 4
B
US
IN
GND
B
US
OUT
SLAVE 15
DSI1O
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