參數(shù)資料
型號： MC68HC705X4CDW
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： HCMOS Microcontroller Unit
中文描述： 8-BIT, OTPROM, 2.2 MHz, MICROCONTROLLER, PDSO28
封裝： PLASTIC, SOIC-28
文件頁數(shù)： 138/156頁
文件大?。?/td> 926K
代理商： MC68HC705X4CDW
Glossary
MC68HC0X4 Rev 1.0
138
Glossary
MOTOROLA
CPU registers
— Memory locations that are wired directly into the CPU logic instead of being
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:
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)
CSIC
— customer-specified integrated circuit
cycle time
— The period of the operating frequency: t
CYC
= 1/f
OP
.
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
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
— See "direct memory access module (DMA)."
DMA service request
— A signal from a peripheral to the DMA module that enables the DMA
module to transfer data.
duty cycle
— 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
— Electrically erasable, programmable, read-only memory. A nonvolatile type of
memory that can be electrically reprogrammed.
EPROM
— Erasable, programmable, read-only memory. A nonvolatile type of memory that can
be erased by exposure to an ultraviolet light source and then reprogrammed.
exception
— An event such as an interrupt or a reset that stops the sequential execution of the
instructions in the main program.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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