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參數資料
型號: MC68HC05X4DW
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, MROM, 2.2 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數: 141/156頁
文件大小: 926K
代理商: MC68HC05X4DW
Glossary
MC68HC0X4 Rev 1.0
MOTOROLA
Glossary
141
mask option
— A optional microcontroller feature that the customer chooses to enable or
disable.
mask option register (MOR)
— An EPROM location containing bits that enable or disable
certain MCU features.
MCU
— Microcontroller unit. See “microcontroller.”
memory location
— Each M68HC08 memory location holds one byte of data and has a unique
address. To store information in a memory location, the CPU places the address of the
location on the address bus, the data information on the data bus, and asserts the write
signal. To read information from a memory location, the CPU places the address of the
location on the address bus and asserts the read signal. In response to the read signal,
the selected memory location places its data onto the data bus.
memory map
— A pictorial representation of all memory locations in a computer system.
microcontroller
— Microcontroller unit (MCU). A complete computer system, including a CPU,
memory, a clock oscillator, and input/output (I/O) on a single integrated circuit.
modulo counter
— A counter that can be programmed to count to any number from zero to its
maximum possible modulus.
monitor ROM
— A section of ROM that can execute commands from a host computer for testing
purposes.
MOR
— See "mask option register (MOR)."
most significant bit (MSB)
— The leftmost digit of a binary number.
multiplexer
— A device that can select one of a number of inputs and pass the logic level of that
input on to the output.
N
— The negative bit in the condition code register of the CPU08. The CPU sets the negative bit
when an arithmetic operation, logical operation, or data manipulation produces a negative
result.
nibble
— A set of four bits (half of a byte).
object code
— The output from an assembler or compiler that is itself executable machine code,
or is suitable for processing to produce executable machine code.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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