Freescale Semiconductor, Inc.
Pa ra lle l Inp ut/ Outp ut
7.2 Introd uc tion
The MC68HC705JJ7 has 14 bidirectional 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)
General Release Specification
MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0
Parallel Input/Output
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