HD64570F Renesas Electronics America, HD64570F Datasheet - Page 205
HD64570F
Manufacturer Part Number
HD64570F
Description
IC SCA SRL COMM ADAPTER 88QFP
Manufacturer
Renesas Electronics America
Datasheet
1.HD64570F.pdf
(469 pages)
Specifications of HD64570F
Applications
ISDN
Interface
Serial
Voltage - Supply
4.5 V ~ 5.5 V
Package / Case
88-QFP
Mounting Type
Surface Mount
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Station
Station
Station
T
A (0)
B (1)
Address
Data
Address
Data
MP = 1
MP = 0
MP = 1
MP = 0
Station
Station
C (2)
D (3)
Figure 5.22 MP Bit Operation Example
In figure 5.22, T is a transmit station, and A, B, C, and D are receive stations. Receive stations A,
B, C, and D are assigned addresses 0, 1, 2, and 3, respectively.
For transmitting data from T to B, transmit station T sends address (1), with MP bit set to 1, to the
communication path. The receive stations all monitor the communications path. When they
receive data with the MP bit = 1, they assume the data is a station address and compare it with
their own address. In this example, the received data matches the address of station B. Station B
now assumes that it is the destination of subsequent data with the MP bit = 0. Other receive
stations A, C, and D, issue a search MP bit command and ignore the data with the MP bit = 0.
Thus, the transmit station can send data to a specific receive station by transmitting the destination
address, with the MP bit set to 1, and then transmitting the data, with the MP bit set to 0.
If the transmit station wants to send data to a different receive station, it transmits the new station
address, with the MP bit set to 1, to clear the search MP bit command. The transmit station can
use the same procedure as described above to communicate with any desired receive station.
Rev. 0, 07/98, page 189 of 453
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