MC68HC705JP7 Datasheet, PDF (84/242 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Parallel Input/Output
7.2 Introduction
The MC68HC705JJ7 has 14 bidirectional input/output (I/O) pins which
form two parallel I/O ports, A and B. The MC68HC705JP7 has
22 bidirectional I/O pins which form three parallel I/O ports, A, B and C.
Each I/O pin is programmable as an input or an output. The contents of
the data direction registers determine the data direction of each of the
I/O pins. All I/O pins have software programmable pulldown devices
which can be enabled or disabled globally by the SWPDI bit in the mask
option register (MOR).
7.3 Port A
Port A is a 6-bit, general-purpose, bidirectional I/O port with these
features:
• Individual programmable pulldown devices
• High current sinking capability on all port A pins, with a maximum
total for port A
• High current sourcing capability on all port A pins, with a maximum
total for port A
• External interrupt capability (pins PA3–PA0)
Advance Information
84
MC68HC705JJ7 • MC68HC705JP7 — REV 4
Parallel Input/Output
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