Technical data

DRM043/D — Rev 0 Designer Reference Manual
MOTOROLA Glossary 25
Designer Reference Manual — DRM043/D
Section 1. Glossary
A — See “accumulators (A and B or D).”
accumulators (A and B or D) — Two 8-bit (A and B) or one 16-bit (D) general-purpose registers
in the CPU. The CPU uses the accumulators to hold operands and results of arithmetic
and logic operations.
acquisition mode — A mode of PLL operation with large loop bandwidth. Also see ’tracking
mode’.
address bus — The set of wires that the CPU or DMA uses to read and write memory locations.
addressing mode — The way that the CPU determines the operand address for an instruction.
The M68HC12 CPU has 15 addressing modes.
ALU — See “arithmetic logic unit (ALU).”
analogue-to-digital converter (ATD) — The ATD module is an 8-channel, multiplexed-input
successive-approximation analog-to-digital converter.
arithmetic logic unit (ALU) — The portion of the CPU that contains the logic circuitry to perform
arithmetic, logic, and manipulation operations on operands.
asynchronous — Refers to logic circuits and operations that are not synchronized by a common
reference signal.
ATD — See “analogue-to-digital converter”.
B — See “accumulators (A and B or D).”
baud rate — The total number of bits transmitted per unit of time.
BCD — See “binary-coded decimal (BCD).”
binary — Relating to the base 2 number system.
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