Datasheet

Glossary
MC9S12DP256 — Revision 1.1
Glossary
overflow — A quantity that is too large to be contained in one byte or
one word.
page zero — The first 256 bytes of memory (addresses $0000–$00FF).
parity — An error-checking scheme that counts the number of logic 1s
in each byte transmitted. In a system that uses odd parity, every
byte is expected to have an odd number of logic 1s. In an even
parity system, every byte should have an even number of logic
1s. In the transmitter, a parity generator appends an extra bit to
each byte to make the number of logic 1s odd for odd parity or
even for even parity. A parity checker in the receiver counts the
number of logic 1s in each byte. The parity checker generates an
error signal if it finds a byte with an incorrect number of logic 1s.
PC — See “program counter (PC).”
peripheral — A circuit not under direct CPU control.
phase-locked loop (PLL) — A clock generator circuit in which a voltage
controlled oscillator produces an oscillation which is
synchronized to a reference signal.
PLL — See "phase-locked loop (PLL)."
pointer — Pointer register. An index register is sometimes called a
pointer register because its contents are used in the calculation
of the address of an operand, and therefore points to the operand.
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