MC68LC302 Datasheet, PDF (114/169 Pages) Motorola, Inc – Low Power Integrated Multiprotocol Processor Reference Manual

Signal Description
SPRXD / PA8
SPTXD / PA9
SPCLK / PA10
PA12
Figure 5-11. PAIO / SCP Pins
These four pins can be used either as the SCP port or parallel I/O pins. If the SCP is enabled
(EN bit in SPMODE register is set), then the three lines must be connected to the SCP port
by setting the appropriate bits in the Port A Control Register. Otherwise, they are connected
to the general purpose I/O.
Three of the port A I/O pins can be configured individually to be general-purpose I/O pins or
a SCP pin.
SPRXD/PA8—SCP Receive Serial Data/Port A pin 8
This signal functions as the SCP receive data input or may be used as a general purpose
I/O pin.
SPTXD/PA9—SCP Transmit Serial Data/Port A pin 9
This output is the SCP transmit data output or may be used as a general purpose I/O pin.
SPCLK/CD3—SCP Clock/NMSI3 CD Pin
This bidirectional signal is used as the SCP clock output or may be used as a general pur-
pose I/O pin.
MODCLK/PA12
After Total System Reset this pin functions as bit 12 of port A.
5.16 TIMER PINS
The timer pins are shown in Figure 5-12.
TIN1 / PB3
TIN2 / PB5
TOUT2 / PB6
WDOG / PB7
Figure 5-12. Timer Pins
5-19
MC68LC302 REFERENCE MANUAL
MOTOROLA