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Control Bits
SYN
TE0
TE1
0
0
X
0
0
X
0
1
X
0
1
X
1
0
0
1
0
0
1
0
0
1
0
0
1
0
1
1
0
1
1
0
1
1
0
1
1
1
0
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
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
is configured as a transmit data signal, it is always an output signal, regardless of
SC1
the SCD1 bit value. As an output, it is fully synchronized with the other ESSI transmit data
signals (
and
STD
SC0
function is not in use.
Table 7-2. Mode and Signal Definitions
TE2
RE
SC0
X
0
U
X
1
RXC
X
0
U
X
1
RXC
0
0
U
0
1
F0/U
1
0
F0/U
1
1
F0/U
0
0
TD1
0
1
TD1
1
0
TD1
1
1
TD1
0
0
F0/U
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 (P1) when the ESSI
SC1
Enhanced Synchronous Serial Interface (ESSI)
ESSI Data and Control Signals
ESSI Signals
SC1
SC2
U
U
FSR
U
U
FST
FSR
FST
U
U
F1/T0D/U
FS
TD2
FS
TD2
FS
F1/T0D/U
FS
F1/T0D/U
FS
TD2
FS
TD2
FS
F1/T0D/U
FS
F1/T0D/U
FS
TD2
FS
TD2
FS
F1/T0D/U
FS
F1/T0D/U
FS
TD2
FS
TD2
FS
SC1
SCK
STD
SRD
U
U
U
U
U
RD
TXC
TD0
U
TXC
TD0
RD
U
U
U
XC
U
RD
XC
U
U
XC
U
RD
XC
U
U
XC
U
RD
XC
U
U
XC
U
RD
XC
TD0
U
XC
TD0
RD
XC
TD0
U
XC
TD0
RD
XC
TD0
U
XC
TD0
RD
XC
TD0
U
XC
TD0
RD
is used as serial
SC1
7-5
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