HD6432646 Hitachi, HD6432646 Datasheet - Page 754

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HD6432646

Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet

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External circuitry such as that shown below is recommended around the PLL.
Place oscillation stabilization capacitor C1 and resistor R1 close to the PLLCAP pin, and ensure
that no other signal lines cross this line. Supply the C1 ground from PLLVSS.
Separate PLLVSS from the other VSS lines at the board power supply source, and be sure to insert
bypass capacitors CB close to the pins.
720
Note: * CB is laminated ceramic capacitors.
Figure 21-5 Points for Attention when Using PLL Oscillation Circuit
PLLCAP
PLLV
V
V
CC
SS
SS
R1: 3 k
CB: 0.1 F *
C1: 470 pF
(Values are preliminary recommended values.)

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