General Description
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 2.4 Input/Output Programming.
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.
NOTE: Any unused inputs, I/O ports, and no connects should be tied to an appropriate logic level (either VDD or VSS). Although the I/O ports of the do not require termination, termination is recommended to reduce the possibility of static damage.
General Release Specification | | MC68HC05RC16 — Rev. 3.0 |
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26 | General Description | MOTOROLA |
