MC912DG128A Motorola, MC912DG128A Datasheet - Page 393

• Manufacturer Part Number: MC912DG128A
• Description: Microcontrollers
• Manufacturer: Motorola

ECT — See “enhanced capture timer.”
EEPROM — Electrically erasable, programmable, read-only memory. A nonvolatile type of
EPROM — Erasable, programmable, read-only memory. A nonvolatile type of memory that can
enhanced capture timer (ECT) — The HC12 Enhanced Capture Timer module has the features
exception — An event such as an interrupt or a reset that stops the sequential execution of the
fetch — To copy data from a memory location into the accumulator.
firmware — Instructions and data programmed into nonvolatile memory.
flash EEPROM — Electrically erasable, programmable, read-only memory. A nonvolatile type of
free-running counter — A device that counts from zero to a predetermined number, then rolls
full-duplex transmission — Communication on a channel in which data can be sent and
hexadecimal — Base 16 numbering system that uses the digits 0 through 9 and the letters A
high byte — The most significant eight bits of a word.
illegal address — An address not within the memory map
illegal opcode — A nonexistent opcode.
index registers (IX and IY) — Two 16-bit registers in the CPU. In the indexed addressing
input/output (I/O) — Input/output interfaces between a computer system and the external world.
MOTOROLA
memory that can be electrically erased and reprogrammed.
be erased by exposure to an ultraviolet light source and then reprogrammed.
of the HC12 Standard Timer module enhanced by additional features in order to enlarge
the field of applications.
instructions in the main program.
memory that can be electrically erased and reprogrammed. Does not support byte or word
erase.
over to zero and begins counting again.
received simultaneously.
through F.
modes, the CPU uses the contents of IX or IY to determine the effective address of the
operand. IX and IY can also serve as a temporary data storage locations.
A CPU reads an input to sense the level of an external signal and writes to an output to
change the level on an external signal.
Glossary
MC68HC912DT128A Rev 1.0
Glossary
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