Power, Ground and Peripheral Signals
MOTOROLA
Pin Descriptions
2-15
Preliminary
2
Table 2-10. Serial Communication Interface 1
Signal Name
Signal Type
853
Pins
854
Pins
855
Pins
857
Pins
858
Pins
RXD1
(GPIOE2)
Input
Input / Output
Serial Receive Data 1—This input receives
byte-oriented serial data and transfers it to the
SCI1 receive shift receiver.
Port E GPIO 2—This is a General Purpose I/O pin
capable of being independently programmed as an
input or output pin.
11
1
TXD1
(GPIOE3)
Output(Z)
Input / Output
Serial Transmit Data 1—This signal transmits
data from the SCI1 transmit data register.
Port E GPIO 3—This is a General Purpose I/O pin
capable of being independently programmed as an
input or output pin.
11
1
Table 2-11. Enhanced Synchronous Serial Interface 0
Signal Name
Signal Type
853
Pins
854
Pins
855
Pins
857
Pins
858
Pins
STD0
(GPIOC0)
Output(Z)
Input / Output
ESSI Transmit Data 0—This output pin transmits
serial data from the ESSI Transmitter Shift
Register.
Port C GPIO 0—This is a General Purpose I/O pin
when the ESSI is not in use.
11
1
SRD0
(GPIOC1)
Input
Input / Output
ESSI Receive Data 0—This input pin receives
serial data and transfers the data to the ESSI
Transmitter Shift Register.
Port C GPIO 1—This is a General Purpose I/O pin
when the ESSI is not is use.
11
1
SCK0
(GPIOC2)
Input / Output
Input / Output
ESSI Serial Clock 0—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 C GPIO 2—This is a General Purpose I/O pin
when the ESSI is not is use.
11
1
SC00
(GPIOC3)
Input / Output
Input / Output
ESSI Serial Control Pin 0—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 transmitter 1 output or for serial
I/O flag 0.
Port C GPIO 3—This is a General Purpose I/O pin
when the ESSI is not in use.
11
1