Motorola MC68HC05RC8 User Manual
General Description
General Release Specification
MC68HC05RC16 — Rev. 3.0
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General Description
MOTOROLA
1.5.9 PC0–PC3 (PC4–PC7)
These eight I/O lines comprise port C. PC0 is a high-current pin.
PC4–PC7 are available only in the 44-lead PLCC package. The state of
any pin is software programmable and all port C lines are configured as
input during power-on or reset. For detailed information on I/O
programming, see
PC4–PC7 are available only in the 44-lead PLCC package. The state of
any pin is software programmable and all port C lines are configured as
input during power-on or reset. For detailed information on I/O
programming, see
.
NOTE:
Only four bits of port C are bonded out in 28-pin packages for the
MC68HC05RC16, although port C is truly an 8-bit port. Since pins
PC4–PC7 are unbonded, software should include the code to set their
respective data direction register locations to outputs to avoid floating
inputs.
MC68HC05RC16, although port C is truly an 8-bit port. Since pins
PC4–PC7 are unbonded, software should include the code to set their
respective data direction register locations to outputs to avoid floating
inputs.
NOTE:
Any unused inputs, I/O ports, and no connects should be tied to an
appropriate logic level (either V
appropriate logic level (either V
DD
or V
SS
). Although the I/O ports of the
do not require termination, termination is recommended to reduce the
possibility of static damage.
possibility of static damage.