HMS81032TL datasheet(37/77 Pages) HYNIX

37 / 77 page

HMS81004E/08E/16E/24E/32E

JUNE 2001 Ver 1.00

10.1 Oscillation Circuit

Oscillation circuit is designed to be used either with a ce-

ramic resonator or crystal oscillator. Figure 10-2 shows

circuit diagrams using a crystal (or ceramic) oscillator. As

shown in the diagram, oscillation circuits can be construct-

ed by connecting a oscillator between Xout and Xin. Colck

from oscillation circuit makesCPU clock via clock pulse

generator, and then enters prescaler to make peripheral

hardware clock. Alternately, the oscillator may be driven

from an esternal source as Figure 10-3 . In the STOP

mode,oscillation stop, Xout state goes to “HIGH” , Xin

state goes to “LOW” , and built-in feed back resistor is dis-

abled.

Oscillation circuit is designed to be used either with a ce-

ramic resonator or crystal oscillator. Since each crystal and

ceramic resonator have their own characteristics, the user

should consult the crystal manufacturer for appropriate

values of external components. In addition, see Figure 10-

4 for the layout of the crystal.

Note: Minimize the wiring length. Do not allow the wiring to

intersect with other signal conductors. Do not allow the wir-

ing to come near changing high current. Set the potential of

the grounding position of the oscillator capacitor to that of

VSS. Do not ground it to any ground pattern where high cur-

rent is present. Do not fetch signals from the oscillator.

Figure 10-4 Recommend Layout of Oscillator PCB

circuit

Figure 10-2 External Crystal(Ceramic) oscillator circuit

Figure 10-3 External clock input circuit

Xout

Xin

Vss

Cout

Cin

Xout

Xin

Vss

OPEN

External

Clock

Source

XOUT

XIN

HMS81032TL Datasheet(PDF) 37 Page - Hynix Semiconductor

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