MC68HC05P18A Datasheet, PDF (55/130 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Technical Data — MC68HC05P18A
Section 7. Input/Output (I/O) Ports
7.1 Contents
7.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
7.3 Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
7.4 Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
7.5 Port C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
7.6 Port D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
7.7 I/O Port Programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
7.2 Introduction
In user mode, 20 bidirectional input/output (I/O) lines are arranged as:
• Two 8-bit I/O ports, port A and port C
• One 3-bit I/O port, port B
• 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). There is also an
input-only pin associated with port D.
MC68HC05P18A
Input/Output (I/O) Ports
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Technical Data