Freescale Semiconductor, Inc.
Advance Information — MC68HC908RFRK2
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
Twelve bidirectional input/output (I/O) pins form two parallel ports in the
32-pin low-profile quad flat pack (LQFP). 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 V or
DD
V . Although the I/O ports do not require termination for proper
SS
operation, termination reduces excess current consumption and the
possibility of electrostatic damage.
MC68HC908RFRK2
MOTOROLA
Advance Information
Input/Output (I/O) Ports
175
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