MC68HC908QY2 MOTOROLA [Motorola, Inc], MC68HC908QY2 Datasheet - Page 161

• Manufacturer Part Number: MC68HC908QY2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

12.1 Contents
12.2 Introduction
MOTOROLA
Data Sheet — MC68HC908QY4
MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
NOTE:
12.2
12.3
12.3.1
12.3.2
12.3.3
12.4
12.4.1
12.4.2
12.4.3
The MC68HC908QT1, MC68HC908QT2, and MC68HC908QT4 have
five bidirectional input-output (I/O) pins and one input only pin. The
MC68HC908QY1, MC68HC908QY2, and MC68HC908QY4 have
thirteen bidirectional pins and one input only pin. All I/O pins are
programmable as inputs or outputs.
Connect any unused I/O pins to an appropriate logic level, either V
V
operation, termination reduces excess current consumption and the
possibility of electrostatic damage.
Figure 12-1
SS
. Although the I/O ports do not require termination for proper
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
Port A Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Data Direction Register A. . . . . . . . . . . . . . . . . . . . . . . . . . 164
Port A Input Pullup Enable Register. . . . . . . . . . . . . . . . . . 166
Port B Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
Data Direction Register B. . . . . . . . . . . . . . . . . . . . . . . . . . 168
Port B Input Pullup Enable Register. . . . . . . . . . . . . . . . . . 169
provides a summary of the I/O registers.
Section 12. Input/Output (I/O) Ports
Input/Output (I/O) Ports
DD
161
or