Datasheet

Glossary
MC9S12DP256 — Revision 1.1
Glossary
stop bit — A bit that signals the end of an asynchronous serial
transmission.
subroutine — A sequence of instructions to be used more than once in
the course of a program. The last instruction in a subroutine is a
return from subroutine (RTS) instruction. At each place in the
main program where the subroutine instructions are needed, a
jump or branch to subroutine (JSR or BSR) instruction is used to
call the subroutine. The CPU leaves the flow of the main program
to execute the instructions in the subroutine. When the RTS
instruction is executed, the CPU returns to the main program
where it left off.
synchronous — Refers to logic circuits and operations that are
synchronized by a common reference signal.
timer — A module used to relate events in a system to a point in time.
toggle — To change the state of an output from a logic 0 to a logic 1 or
from a logic 1 to a logic 0.
tracking mode — A mode of PLL operation with narrow loop bandwidth.
Also see ‘acquisition mode.’
two’s complement — A means of performing binary subtraction using
addition techniques. The most significant bit of a two’s
complement number indicates the sign of the number (1 indicates
negative). The two’s complement negative of a number is
obtained by inverting each bit in the number and then adding 1 to
the result.
unbuffered — Utilizes only one register for data; new data overwrites
current data.
unimplemented memory location — A memory location that is not
used. Writing to an unimplemented location has no effect.
Reading an unimplemented location returns an unpredictable
value.
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