w65c265s Western Design Center, Inc., w65c265s Datasheet - Page 57

• Manufacturer Part Number: w65c265s
• Description: W65c265s 16?bit Microcontroller
• Manufacturer: Western Design Center, Inc.

4.4
The following circuit is a possible clocking system for the W65C265S providing both 32.768KHz and 4MHz
frequencies. The 32.768KHz clock is well suited for setting up a time of day clock with one of the
W65C265S's internal timers.
In constructing this oscillator circuit, components should be kept as physically close to the W65C265S
possible and any excess in component leads should be trimmed off.
C1 = 47pF
C2 = 27pF
C3 = 22pF
C4 = 5-30pF variable
XTAL1 = 4 MHz
Note:
1.
2.
Recommended clock and fclock oscillators
Depending on trace layout or construction techniques used, values may need to be altered slightly.
Pin numbers only apply to PLCC package only.
XTA L2 = 32.768 KHz
R0 = 100Ω
R1 = 800KΩ
R2 = 2.6MΩ
R3 = 150KΩ
Figure 4-8 Oscillator Circuit
as
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