MC68HC708XL36 FREESCALE [Freescale Semiconductor, Inc], MC68HC708XL36 Datasheet - Page 358

• Manufacturer Part Number: MC68HC708XL36
• Description: HCMOS Microcontroller Unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Glossary
N — The negative bit in the condition code register of the CPU08. The CPU sets the negative bit
nibble — A set of four bits (half of a byte).
object code — The output from an assembler or compiler that is itself executable machine code,
opcode — A binary code that instructs the CPU to perform an operation.
open-drain — An output that has no pullup transistor. An external pullup device can be
operand — Data on which an operation is performed. Usually a statement consists of an
oscillator — A circuit that produces a constant frequency square wave that is used by the
OTPROM — One-time programmable read-only memory. A nonvolatile type of memory that
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.
PC — See “program counter (PC).”
peripheral — A circuit not under direct CPU control.
MC68HC708XL36
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when an arithmetic operation, logical operation, or data manipulation produces a negative
result.
or is suitable for processing to produce executable machine code.
connected to the power supply to provide the logic 1 output voltage.
operator and an operand. For example, the operator may be an add instruction, and the
operand may be the quantity to be added.
computer as a timing and sequencing reference.
cannot be reprogrammed.
In a system that uses odd parity, every byte is expected to have an odd number of logic
ones. In an even parity system, every byte should have an even number of logic ones. 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.
Freescale Semiconductor, Inc.
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Glossary
MOTOROLA