53
8Bit Single Chip Microcontroller
DMC73C168
PHASE LOCKED LOOP (PLL)
LATCH
SWALLOW COUNTER
4BIT
1/16, 1/17
PRESCALER
VCOH
A
T/F
4BIT REG.
4
Data BUS (8Bit)
4
8
MSB
SEL.
LSB
8
12 BIT REG.
12 BIT
1
A
VCOL
SEL
PROGRAM COUNTER
4
1
PLL Control
REG
1KHz
5KHz
PHASE
DETECTOR
6.25KHz
9KHz
UL
SEL
10KHz
12.5KHz
25KHz
50KHz
Xin
BF
BF
4.5MHz
EO2 EO1
XOUT
REF. DIVIDER
450KHz 6.25KHz 1KHz
5KHz
100KHz
Figure 5-7 PLL Block Diagram
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