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MC68HC908MR8 Datasheet, PDF (362/372 Pages) Motorola, Inc – Microcontrollers | |||
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CSIC â customer-specified integrated circuit
cycle time â The period of the operating frequency: tCYC = 1/fOP.
decimal number system â Base 10 numbering system that uses the digits zero through nine.
direct memory access module (DMA) â A M68HC08 Family module that can perform data
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.
DMA â See direct memory access module (DMA).
DMA service request â A signal from a peripheral to the DMA module that enables the DMA
module to transfer data.
duty cycle â A ratio of the amount of time the signal is on versus the time it is off. Duty cycle is
usually represented by a percentage.
EEPROM â Electrically erasable, programmable, read-only memory. A non-volatile type of
memory that can be electrically reprogrammed.
EPROM â Erasable, programmable, read-only memory. A non-volatile type of memory that can
be erased by exposure to an ultraviolet light source and then reprogrammed.
exception â An event such as an interrupt or a reset that stops the sequential execution of the
instructions in the main program.
external interrupt module (IRQ) â A module in the M68HC08 Family with both dedicated
external interrupt pins and port pins that can be enabled as interrupt pins.
fetch â To copy data from a memory location into the accumulator.
firmware â Instructions and data programmed into non-volatile memory.
free-running counter â A device that counts from zero to a predetermined number, then rolls
over to zero and begins counting again.
full-duplex transmission â Communication on a channel in which data can be sent and
received simultaneously.
H â The upper byte of the 16-bit index register (H:X) in the CPU08.
Technical Data
362
MC68HC908MR8 â Rev 4.1
Freescale Semiconductor
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