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MC68HC908RK2 Datasheet, PDF (173/232 Pages) Motorola, Inc – Microcontroller Unit
Advance Information — MC68HC908RK2
Section 13. Input/Output (I/O) Ports
13.1 Contents
13.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
13.3 Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
13.3.1 Port A Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
13.3.2 Data Direction Register A. . . . . . . . . . . . . . . . . . . . . . . . . . 176
13.4 Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
13.4.1 Port B Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
13.4.2 Data Direction Register B . . . . . . . . . . . . . . . . . . . . . . . . . 179
13.2 Introduction
Fourteen bidirectional input/output (I/O) pins form two parallel ports in
the 20-pin SSOP/SOIC package. All I/O pins are programmable as
inputs or outputs. Port A bits PTA6–PTA1 have keyboard wakeup
interrupts and internal pullup resistors.
NOTE:
Connect any unused I/O pins to an appropriate logic level, either VDD or
VSS. Although the I/O ports do not require termination for proper
operation, termination reduces excess current consumption and the
possibility of electrostatic damage.
MC68HC908RK2 — Rev. 4.0
MOTOROLA
Input/Output (I/O) Ports
Advance Information
173