Datasheet

Glossary
MC9S12DP256 — Revision 1.1
Glossary
RAM — Random access memory. All RAM locations can be read or
written by the CPU. The contents of a RAM memory location
remain valid until the CPU writes a different value or until power
is turned off.
RC circuit — A circuit consisting of capacitors and resistors having a
defined time constant.
read — To copy the contents of a memory location to the accumulator.
register — A circuit that stores a group of bits.
reserved memory location — A memory location that is used only in
special factory test modes. Writing to a reserved location has no
effect. Reading a reserved location returns an unpredictable
value.
reset — To force a device to a known condition.
ROM — Read-only memory. A type of memory that can be read but
cannot be changed (written). The contents of ROM must be
specified before manufacturing the MCU.
SCI — See "serial communication interface module (SCI)."
serial — Pertaining to sequential transmission over a single line.
serial communications interface module (SCI) — A module that
supports asynchronous communication.
serial peripheral interface module (SPI) — A module that supports
synchronous communication.
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