MC68HC705P6A Datasheet, PDF (51/130 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Advance Information — MC68HC705P6A
Section 6. Input/Output Ports
6.1 Contents
6.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
6.3 Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
6.4 Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
6.5 Port C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6.6 Port D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
6.7 I/O Port Programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
6.2 Introduction
In the user mode, 20 bidirectional I/O lines are arranged as two 8-bit I/O
ports (ports A and C), one 3-bit I/O port (port B), and one 1-bit I/O port
(port D). These ports are programmable as either inputs or outputs
under software control of the data direction registers (DDRs). Port D also
contains one input-only pin.
MC68HC705P6A — Rev. 2.0
MOTOROLA
Input/Output Ports
Advance Information
51