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ESSI Data and Control Signals
Table 7-2. Mode and Signal Definitions (Continued)
Control Bits
ESSI Signals
SYN
1
1
1
1
1
1
1
TE0
1
1
1
1
1
1
1
TE1
0
0
0
1
1
1
1
TE2
0
1
1
0
0
1
1
RE
1
0
1
0
1
0
1
SC0
F0/U
F0/U
F0/U
TD1
TD1
TD1
TD1
SC1
F1/T0D/U
TD2
TD2
F1/T0D/U
F1/T0D/U
TD2
TD2
SC2
FS
FS
FS
FS
FS
FS
FS
SCK
XC
XC
XC
XC
XC
XC
XC
STD
TD0
TD0
TD0
TD0
TD0
TD0
TD0
SRD
RD
U
RD
U
RD
U
RD
TXC
RXC
XC
FST
FSR
FS
TD0
TD1
TD2
T0D
RD
F0
F1
U
X
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
Transmitter clock
Receiver clock
Transmitter/receiver clock (synchronous operation)
Transmitter frame sync
Receiver frame sync
Transmitter/receiver frame sync (synchronous operation)
Transmit data signal 0
Transmit data signal 1
Transmit data signal 2
Transmitter 0 drive enable if SSC1 = 1 & SCD1 = 1
Receive data
Flag 0
Flag 1 if SSC1 = 0
Unused (can be used as GPIO signal)
Indeterminate
When configured as an output, SC1 functions as a serial Output Flag, as the transmitter 0
drive-enabled signal, or as the receive frame sync signal output. If SC1 is used as serial Output
Flag 1, its value is determined by the value of the serial Output Flag 1 (OF1) bit in the CRB.
When configured as an input, this signal can receive frame sync signals from an external source,
or it acts as a serial input flag. As a serial input flag, SC1controls status bit IF1 in the SSISR.
When SC1 is configured as a transmit data signal, it is always an output signal, regardless of the
SCD1 bit value. As an output, it is fully synchronized with the other ESSI transmit data signals
( STD and SC0 ). SC1 can be programmed as a GPIO signal (P1) when the ESSI SC1 function is not
in use.
7.2.6 Serial Control Signal (SC2)
ESSI0:SC02; ESSI1:SC12
SC2
is a frame sync I/O signal for both the transmitter and receiver in Synchronous mode and for
the transmitter only in Asynchronous mode. The direction of this signal is determined by the
SCD2 bit in the CRB. When configured as an output, this signal outputs the internally generated
frame sync signal. When configured as an input, this signal receives an external frame sync signal
for the transmitter in Asynchronous mode and for both the transmitter and receiver when in
Synchronous mode. SC2 can be programmed as a GPIO signal ( P2 ) when the ESSI SC2 function is
not in use.
DSP56311 User’s Manual, Rev. 2
Freescale Semiconductor
7-5
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