Datasheet

Glossary
MC9S12DP256 — Revision 1.1
Glossary
set — To change a bit from logic 0 to logic 1; opposite of clear.
shift register — A chain of circuits that can retain the logic levels (logic
1 or logic 0) written to them and that can shift the logic levels to
the right or left through adjacent circuits in the chain.
signed — A binary number notation that accommodates both positive
and negative numbers. The most significant bit is used to indicate
whether the number is positive or negative, normally logic 0 for
positive and logic 1 for negative. The other seven bits indicate the
magnitude of the number.
software — Instructions and data that control the operation of a
microcontroller.
software interrupt (SWI) — An instruction that causes an interrupt and
its associated vector fetch.
SPI — See "serial peripheral interface module (SPI)."
stack — A portion of RAM reserved for storage of CPU register contents
and subroutine return addresses.
stack pointer (SP) — A 16-bit register in the CPU containing the
address of the next available storage location on the stack.
start bit — A bit that signals the beginning of an asynchronous serial
transmission.
status bit — A register bit that indicates the condition of a device.
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