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Power, Ground and Peripheral Signals
5685X Digital Signal Controller User Manual, Rev. 4
2-18
Freescale Semiconductor
SCK1
(GPIOD2)
Input
/ Output
Input / Output
ESSI Serial Clock (SCK1)
—This bidirectional pin
provides the serial bit rate clock for the transmit
section of the ESSI. The clock signal can be
continuous or gated and can be used by both the
transmitter and receiver in synchronous mode.
Port D GPIO 2
—This is a General Purpose I/O pin
available when the ESSI is not in use.
ESSI Serial Control Pin 0 (SC10)
—The function
of this pin is determined by the selection of either
synchronous or asynchronous mode. For
asynchronous mode, this pin will be used for the
receive clock I/O. For synchronous mode, this pin
is used either for transmitter1 output or for serial
I/O flag 0.
—
—
—
1
1
SC10
(GPIOD3)
Input
/ Output
Input / Output
Port D GPIO 3
—This is a General Purpose I/O pin
available when the ESSI is not in use.
ESSI Serial Control Pin 1 (SC11)
—The function
of this pin is determined by the selection of either
synchronous or asynchronous mode. For
asynchronous mode, this pin is the receiver frame
sync I/O. For synchronous mode, this pin is used
either for transmitter2 output or for serial I/O flag 1.
—
—
—
1
1
SC11
(GPIOD4)
Input
/ Output
Input / Output
Port D GPIO (4)
—This is a General Purpose I/O
pin available when the ESSI is not in use.
ESSI Serial Control Pin 2 (SC12)
—This pin is
used for frame sync I/O. SC02 is the frame sync
for both the transmitter and receiver in
synchronous mode and for the transmitter only in
asynchronous mode. When configured as an
output, this pin is the internally generated frame
sync signal. When configured as an input, this pin
receives an external frame sync signal for the
transmitter (and the receiver in synchronous
operation).
—
—
—
1
1
SC12
(GPIOD5)
Input
/ Output
Input / Output
Port D GPIO 5
—This is a General Purpose I/O pin
available when the ESSI is not in use.
—
—
—
1
1
Table 2-12. Enhanced Synchronous Serial Interface 1 (Continued)
Signal Name
Signal Type
Signal Description
853
Pins
854
Pins
855
Pins
857
Pins
858
Pins