XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 566

• Manufacturer Part Number: XC908AS60ACFU
• Description: MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
• Manufacturer: Motorola Semiconductor Products

Glossary
CPU cycles — A CPU cycle is one period of the internal bus clock, normally derived by dividing
CPU registers — Memory locations that are wired directly into the CPU logic instead of being
CSIC — customer-specified integrated circuit
cycle time — The period of the operating frequency: t
decimal number system — Base 10 numbering system that uses the digits zero through nine.
direct memory access module (DMA) — A M68HC08 Family module that can perform data
DMA — See "direct memory access module (DMA)."
DMA service request — A signal from a peripheral to the DMA module that enables the DMA
duty cycle — A ratio of the amount of time the signal is on versus the time it is off. Duty cycle is
EEPROM — Electrically erasable, programmable, read-only memory. A nonvolatile type of
EPROM — Erasable, programmable, read-only memory. A nonvolatile type of memory that can
Technical Data
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a crystal oscillator source by two or more so the high and low times will be equal. The
length of time required to execute an instruction is measured in CPU clock cycles.
part of the addressable memory map. The CPU always has direct access to the
information in these registers. The CPU registers in an M68HC08 are:
transfers between any two CPU-addressable locations without CPU intervention. For
transmitting or receiving blocks of data to or from peripherals, DMA transfers are faster
and more code-efficient than CPU interrupts.
module to transfer data.
usually represented by a percentage.
memory that can be electrically reprogrammed.
be erased by exposure to an ultraviolet light source and then reprogrammed.
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A (8-bit accumulator)
H:X (16-bit index register)
SP (16-bit stack pointer)
PC (16-bit program counter)
CCR (condition code register containing the V, H, I, N, Z, and C
bits)
Glossary
CYC
= 1/f
OP
.
MC68HC908AZ60A — Rev 2.0
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