Datasheet

Glossary
MC9S12DP256 — Revision 1.1
Glossary
CPU registers — Memory locations that are wired directly into the CPU
logic instead of being part of the addressable memory map. The
CPU always has direct access to the information in these
registers. The CPU registers in an M68HC12 are:
• A (8-bit accumulator)
• B (8-bit accumulator)
– D (16-bit accumulator formed by concatenation of
accumulators A and B)
• IX (16-bit index register)
• IY (16-bit index register)
• SP (16-bit stack pointer)
• PC (16-bit program counter)
• CCR (8-bit condition code register)
cycle time — The period of the operating frequency: t
CYC
= 1/f
OP
.
D — See “accumulators (A and B or D).”
decimal number system — Base 10 numbering system that uses the
digits zero through nine.
duty cycle — A ratio of the amount of time the signal is on versus the
time it is off. Duty cycle is usually represented by a percentage.
ECT — See “enhanced capture timer.”
EEPROM — Electrically erasable, programmable, read-only memory. A
nonvolatile type of memory that can be electrically erased and
reprogrammed.
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
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