MC68HC705J MOTOROLA [Motorola, Inc], MC68HC705J Datasheet - Page 87

• Manufacturer Part Number: MC68HC705J
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

6.1 Contents
6.2 Introduction
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data — MC68HC705J1A
NOTE:
6.2
6.3
6.3.1
6.3.2
6.3.3
6.3.4
6.3.5
6.4
6.4.1
6.4.2
6.4.3
6.5
6.6
Fourteen bidirectional pins form one 8-bit input/output (I/O) port and one
6-bit I/O port. All the bidirectional port 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.
Section 6. Parallel Input/Output (I/O) Ports
SS.
Although the I/O ports do not require termination for proper
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
5.0-Volt I/O Port Electrical Characteristics . . . . . . . . . . . . . . . . 95
3.3-Volt I/O Port Electrical Characteristics . . . . . . . . . . . . . . . . 95
Port A Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Data Direction Register A. . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Pulldown Register A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Port A LED Drive Capability . . . . . . . . . . . . . . . . . . . . . . . . . 92
Port A I/O Pin Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Port B Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Data Direction Register B. . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Pulldown Register B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Parallel Input/Output (I/O) Ports
Technical Data
DD
or
87