MC68HC05V12 Datasheet, PDF (81/246 Pages) Freescale Semiconductor, Inc – HCMOS Microcontreller Unit

Freescale Semiconductor, Inc.
Technical Data — MC68HC05V12
Section 7. Parallel Input/Output (I/O)
7.1 Contents
7.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
7.3 Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
7.3.1 Port A Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
7.3.2 Port A Data Direction Register . . . . . . . . . . . . . . . . . . . . . . .83
7.4 Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
7.4.1 Port B Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
7.4.2 Port B Data Direction Register . . . . . . . . . . . . . . . . . . . . . . .84
7.5 Port C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
7.5.1 Port C Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85
7.5.2 Port C Data Direction Register . . . . . . . . . . . . . . . . . . . . . . .85
7.5.3 Port C I/O Pin Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . .85
7.6 Port D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
7.2 Introduction
In single-chip mode, 23 bidirectional input/output (I/O) lines are arranged
as two 8-bit I/O ports (ports B and C), and one 7-bit I/O port (port A).
There is one 5-bit input port (port D). The individual bits in the I/O ports
are programmable as either inputs or outputs under software control by
the data direction registers (DDRs). The port C pins also have the
additional property of acting as IRQ interrupt input sources.
MC68HC05V12 — Rev. 2.0
Parallel Input/Output (I/O)
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Technical Data