參數(shù)資料
型號: MC68HC05CL48
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 1.802 MHz, MICROCONTROLLER, PQFP112
封裝: TQFP-112
文件頁數(shù): 12/145頁
文件大小: 673K
代理商: MC68HC05CL48
June 11, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05CL48
PHASE-LOCKED LOOP
MOTOROLA
REV 2.0
13-3
Figure 13-1. Phase Lock Loop Block Diagram
The phase comparator compares the rising edge of a 8kHz reference signal
derived from the 32kHz crystal clock to the rising edge of the VCO clock after
being divided by the divider. When there is a phase difference between the two
signals, the phase comparator output will adjust the DC level input to the VCO to
change the VCO frequency, see Figure 13-2.
Figure 13-2. Typical Waveform for PLL
32 kHz
VCO
Phase
Detector
Divider
Vss
External
Capacitor
XFC
8 kHz
PON
PCLK
FREQ1
FREQ0
PCSR
Frequency
Select
System clock
CLID clock
(1.8MHz)
32kHz
MUX
R1
R2
OSC
DIVIDE
BY 4
MUX
PLLT
PLLT_IN
32kHz
PLL_CLK
OSCILLATOR
Reference
Signal
8 kHz
VCO out
After divider
Phase
Output
VCO in
Detector
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