mc68hc05x4dw Freescale Semiconductor, Inc, mc68hc05x4dw Datasheet - Page 138

• Manufacturer Part Number: mc68hc05x4dw
• Description: Xc68hc705x4 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Glossary
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
exception — An event such as an interrupt or a reset that stops the sequential execution of the
MC68HC0X4 Rev 1.0
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.
instructions in the main program.
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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)
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Glossary
CYC
= 1/f
OP
.