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