MC68HC908AS60ACFN FREESCALE [Freescale Semiconductor, Inc], MC68HC908AS60ACFN Datasheet - Page 409

• Manufacturer Part Number: MC68HC908AS60ACFN
• Description: M68HC08 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

mask option register (MOR) — An EPROM location containing bits that enable or disable certain MCU
MCU — Microcontroller unit. See “microcontroller.”
memory location — Each M68HC08 memory location holds one byte of data and has a unique address.
memory map — A pictorial representation of all memory locations in a computer system.
microcontroller — Microcontroller unit (MCU). A complete computer system, including a CPU, memory,
modulo counter — A counter that can be programmed to count to any number from zero to its maximum
monitor ROM — A section of ROM that can execute commands from a host computer for testing
MOR — See "mask option register (MOR)."
most significant bit (MSB) — The leftmost digit of a binary number.
multiplexer — A device that can select one of a number of inputs and pass the logic level of that input
N — The negative bit in the condition code register of the CPU08. The CPU sets the negative bit when
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, or is
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 connected to the
operand — Data on which an operation is performed. Usually a statement consists of an operator and
oscillator — A circuit that produces a constant frequency square wave that is used by the computer as
OTPROM — One-time programmable read-only memory. A nonvolatile type of memory that cannot be
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).
Freescale Semiconductor
features.
To store information in a memory location, the CPU places the address of the location on the address
bus, the data information on the data bus, and asserts the write signal. To read information from a
memory location, the CPU places the address of the location on the address bus and asserts the read
signal. In response to the read signal, the selected memory location places its data onto the data bus.
a clock oscillator, and input/output (I/O) on a single integrated circuit.
possible modulus.
purposes.
on to the output.
an arithmetic operation, logical operation, or data manipulation produces a negative result.
suitable for processing to produce executable machine code.
power supply to provide the logic 1 output voltage.
an operand. For example, the operator may be an add instruction, and the operand may be the
quantity to be added.
a timing and sequencing reference.
reprogrammed.
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
Glossary
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