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TC1784
Synchronous Serial Interface (SSC)
User´s Manual
17-7
V1.1, 2011-05
SSC, V1.5
pin SCLK must be switched to input mode. The output of the master’s shift register is
connected to the external transmit line, which in turn is connected to the slaves’ shift
register input. The output of the slaves’ shift register is connected to the external receive
line in order to enable the master to receive the data shifted out of the slave. The external
connections are hard-wired, with the function and direction of these pins determined by
the master or slave operation of the individual device.
Note: The shift direction shown in
applies to both MSB-first and LSB-first
operation.
When initializing the devices in this configuration, one device must be selected for
master operation while all other devices must be programmed for slave operation.
Initialization includes the operating mode of the device’s SSC and also the function of
the respective port lines.
Figure 17-4 SSC Full-Duplex Configuration
The data output pins MRST of all slave devices are connected onto one receive line in
this configuration. During a transfer, each slave shifts out data from its shift register.
There are two ways to avoid collisions on the receive line due to different slave data:
MTSR
MRST
CLK
Clock
MTSR
MRST
CLK
Clock
MCA06216
Shift Register
Device #2
Slave
MTSR
MRST
CLK
Clock
Shift Register
Device #1
Master
Shift Register
Device #3
Slave
Clock
Receive
Transmit
Содержание TC1784
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