MC68HC908RF2 Datasheet, PDF (175/254 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Advance Information — MC68HC908RF2
Section 13. Input/Output (I/O) Ports
13.1 Contents
13.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
13.3 Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
13.3.1 Port A Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
13.3.2 Data Direction Register A. . . . . . . . . . . . . . . . . . . . . . . . . . 178
13.4 Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
13.4.1 Port B Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
13.4.2 Data Direction Register B . . . . . . . . . . . . . . . . . . . . . . . . . 181
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_DD or
V_SS. Although the I/O ports do not require termination for proper
operation, termination reduces excess current consumption and the
possibility of electrostatic damage.
MC68HC908RF2 — Rev. 1
MOTOROLA
Input/Output (I/O) Ports
Advance Information
175