參數(shù)資料
型號： MC68HC705X4
廠商： Motorola, Inc.
英文描述： HCMOS Microcontroller Unit
中文描述： HCMOS微控制器
文件頁數(shù)： 137/156頁
文件大?。?/td> 926K
代理商： MC68HC705X4
Glossary
MC68HC0X4 Rev 1.0
MOTOROLA
Glossary
137
clock generator module (CGM)
— A module in the M68HC08 Family. The CGM generates a
base clock signal from which the system clocks are derived. The CGM may include a
crystal oscillator circuit and or phase-locked loop (PLL) circuit.
comparator
— A device that compares the magnitude of two inputs. A digital comparator defines
the equality or relative differences between two binary numbers.
computer operating properly module (COP)
— A counter module in the M68HC08 Family that
resets the MCU if allowed to overflow.
condition code register (CCR)
— An 8-bit register in the CPU08 that contains the interrupt
mask bit and five bits that indicate the results of the instruction just executed.
control bit
— One bit of a register manipulated by software to control the operation of the
module.
control unit
— One of two major units of the CPU. The control unit contains logic functions that
synchronize the machine and direct various operations. The control unit decodes
instructions and generates the internal control signals that perform the requested
operations. The outputs of the control unit drive the execution unit, which contains the
arithmetic logic unit (ALU), CPU registers, and bus interface.
COP
— See "computer operating properly module (COP)."
counter clock
— The input clock to the TIM counter. This clock is the output of the TIM
prescaler.
CPU
— See “central processor unit (CPU).”
CPU08
— The central processor unit of the M68HC08 Family.
CPU clock
— The CPU clock is derived from the CGMOUT output from the CGM. The CPU
clock frequency is equal to the frequency of the oscillator output, CGMXCLK, divided by
four.
CPU cycles
— A CPU cycle is one period of the internal bus clock, normally derived by dividing
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.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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