MC912DG128A Motorola, MC912DG128A Datasheet - Page 390

• Manufacturer Part Number: MC912DG128A
• Description: Microcontrollers
• Manufacturer: Motorola

Glossary
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.
binary number system — The base 2 number system, having two digits, 0 and 1. Binary
binary-coded decimal (BCD) — A notation that uses 4-bit binary numbers to represent the 10
bit — A binary digit. A bit has a value of either logic 0 or logic 1.
branch instruction — An instruction that causes the CPU to continue processing at a memory
break module — The break module allows software to halt program execution at a
breakpoint — A number written into the break address registers of the break module. When a
break interrupt — A software interrupt caused by the appearance on the internal address bus
bus — A set of wires that transfers logic signals.
bus clock — See "CPU clock".
byte — A set of eight bits.
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arithmetic is convenient in digital circuit design because digital circuits have two
permissible voltage levels, low and high. The binary digits 0 and 1 can be interpreted to
correspond to the two digital voltage levels.
decimal digits and that retains the same positional structure of a decimal number. For
example,
234 (decimal) = 0010 0011 0100 (BCD)
location other than the next sequential address.
programmable point in order to enter a background routine.
number appears on the internal address bus that is the same as the number in the break
address registers, the CPU executes the software interrupt instruction (SWI).
of the same value that is written in the break address registers.
Glossary
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