s908ey8ad4cfjer Freescale Semiconductor, Inc, s908ey8ad4cfjer Datasheet - Page 259

• Manufacturer Part Number: s908ey8ad4cfjer
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Glossary
A — See “accumulator (A).”
accumulator (A) — An 8-bit general-purpose register in the CPU08. The CPU08 uses the accumulator
acquisition mode — A mode of PLL operation during startup before the PLL locks on a frequency. Also
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
ALU — See “arithmetic logic unit (ALU).”
arithmetic logic unit (ALU) — The portion of the CPU that contains the logic circuitry to perform
asynchronous — Refers to logic circuits and operations that are not synchronized by a common
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 arithmetic is
binary-coded decimal (BCD) — A notation that uses 4-bit binary numbers to represent the 10 decimal
bit — A binary digit. A bit has a value of either 0 or 1.
branch instruction — An instruction that causes the CPU to continue processing at a memory location
break module — A module in the M68HC08 Family. The break module allows software to halt program
breakpoint — A number written into the break address registers of the break module. When a number
Freescale Semiconductor
to hold operands and results of arithmetic and logic operations.
see "tracking mode."
M68HC08 CPU has 16 addressing modes.
arithmetic, logic, and manipulation operations on operands.
reference signal.
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.
digits and that retains the same positional structure of a decimal number. For example,
other than the next sequential address.
execution at a programmable point in order to enter a background routine.
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).
234 (decimal) = 0010 0011 0100 (BCD)
MC68HC908EY16 • MC68HC908EY8 Data Sheet, Rev. 10
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