MC912D60ACPVE8 Datasheet, PDF (452/460 Pages) Freescale Semiconductor, Inc – MC68HC912D60A MC68HC912D60C MC68HC912D60P Technical Data

Glossary
memory location — Each M68HC12 memory location holds one byte of data and has a unique
address. 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.
memory map — A pictorial representation of all memory locations in a computer system.
MI-Bus — See "Freescale interconnect bus".
microcontroller — Microcontroller unit (MCU). A complete computer system, including a CPU,
memory, a clock oscillator, and input/output (I/O) on a single integrated circuit.
modulo counter — A counter that can be programmed to count to any number from zero to its
maximum possible modulus.
most significant bit (MSB) — The leftmost digit of a binary number.
Freescale interconnect bus (MI-Bus) — The Freescale Interconnect Bus (MI Bus) is a serial
communications protocol which supports distributed real-time control efficiently and with
a high degree of noise immunity.
Freescale scalable CAN (msCAN) — The Scalable controller area network is a serial
communications protocol that efficiently supports distributed real-time control with a very
high level of data integrity.
msCAN — See "Scalable CAN".
MSI — See "multiple serial interface".
multiple serial interface — A module consisting of multiple independent serial I/O sub-systems,
e.g. two SCI and one SPI.
multiplexer — A device that can select one of a number of inputs and pass the logic level of that
input on to the output.
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 suitable for processing to produce 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
connected to the power supply to provide the logic 1 output voltage.
Technical Data
452
Glossary
MC68HC912D60A — Rev. 3.1
Freescale Semiconductor