TC1784
Synchronous Serial Interface (SSC)
User´s Manual
17-17
V1.1, 2011-05
SSC, V1.5
– MRST is driven with the logic level of bit PISEL.STIP (slave transmit idle state).
– SCLKI is driven with the logic level of CON.PO (clock polarity control).
•
SLSI = 0: SSC is selected as slave.
– The slave receive input signals MTSRA or MTSRB are connected to MTSRI,
depending on PISEL.SRIS (Slave Mode receive input select).
– MRST is directly driven with the slave transmit output signal MRSTI.
– The slave clock input signals SCLKA or SCLKB are connected to SCLKI,
depending on PISEL.SCIS (Slave Mode clock input select).
17.1.2.9 Slave Select Output Generation Unit
In Master Mode, the slave select output generation unit of the SSC automatically
generates up to eight slave select output lines SLSO[7:0] for serial transmit operations.
The slave select output generation unit further makes it possible to adjust the chip select
timing parameters. The active/inactive state of a slave select output as well as the
enable/disable state can be controlled individually for each slave select output (see
). The basic slave select output timing is shown in
a low active level of the SLSOn lines.
Figure 17-9 SSC Slave Select Output Timing
A slave select output period always starts after a write operation to register TB. With a
TB write operation, all timing parameters stored in register SSOTC (LEAD, TRAIL,
First
Bit
t
SLSOL
Invalid
Invalid
MCT06220_mod
SLSOn
t
SLSOL
t
SLSOI
t
SLSOT
MTSR
t
SLSOACT
Last
Bit
Slave Select Output Period
t
SCLK
Data Frame
Note: This timing example is based on the following setup: CON.PH = 0; CON.PO = 1
MRST
SCLK
First
Bit
Last
Bit
Sample points
First
Bit
First
Bit
Содержание TC1784
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