mc68hc908mr24 Freescale Semiconductor, Inc, mc68hc908mr24 Datasheet - Page 399

• Manufacturer Part Number: mc68hc908mr24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

MC68HC908MR24 — Rev. 4.0
MOTOROLA
parity — An error-checking scheme that counts the number of logic 1s
PC — See program counter (PC).
peripheral — A circuit not under direct CPU control.
phase-locked loop (PLL) — An oscillator circuit in which the frequency
PLL — See phase-locked loop (PLL).
pointer — Pointer register. An index register is sometimes called a
polarity — The two opposite logic levels, logic 1 and logic 0, which
polling — Periodically reading a status bit to monitor the condition of a
port — A set of wires for communicating with off-chip devices.
prescaler — A circuit that generates an output signal related to the input
program — A set of computer instructions that causes a computer to
program counter (PC) — A 16-bit register in the CPU08. The PC
pull — An instruction that copies into the accumulator the contents of a
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.
of the oscillator is synchronized to a reference signal.
pointer register because its contents are used in the calculation of the
address of an operand and, therefore, points to the operand.
correspond to two different voltage levels, V
peripheral device.
signal by a fractional scale factor such as 1/2, 1/8, 1/10, etc.
perform a desired operation or operations.
register holds the address of the next instruction or operand that the
CPU will use.
stack RAM location. The stack RAM address is in the stack pointer.
Glossary
DD
and V
Advance Information
SS
.
Glossary
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