7-8
DSP56305 User’s Manual
MOTOROLA
Enhanced Synchronous Serial Interface (ESSI)
ESSI Data and Control Signals
7.3.4
Serial Control Signal (SC0)
In ESSI0: SC00; In ESSI1: SC10
The function of this signal is determined by selecting either Synchronous or
Asynchronous mode (see Figure 7-3, Table 7-4, and Figure 7-15). In Asynchronous
mode, this signal is used for the receive clock I/O. In Synchronous mode, this signal is
used as the transmitter data out signal for Transmit Shift Register 1 or for serial flag I/O.
A typical application of serial flag I/O would be multiple device selection for addressing
in codec systems.
If SC0 is configured as a serial flag signal, its direction is determined by the Serial
Control Direction 0 (SCD0) bit in the ESSI Control Register B (CRB). When configured as
an output, its direction is determined by the value of the serial Output Flag 0 (OF0) bit in
the CRB.
Figure 7-3
SCn0 Pin Configuration
AA1457
CRB
1
0
SYN
SCn0 Pin
CRB
1
0
SCD0
Input
Output
Async
Mode
Sync
Mode
CRB
TE1
CRB
SCD0
1
0
Note:
1.
“n” in SCn0 is ESSI (0 or 1)
2.
TD1 = Transmit Data Signal 1
Input
Output
1
0
Pin
direction?
SCn0
pin is...
Synchronous
operation?
Use
transmitter
#1?
RX Clock
Flag 0
In
Flag 0
Out
TD1
Out
RX Clock
Содержание DSP56305
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