z8f083a ZiLOG Semiconductor, z8f083a Datasheet - Page 165

• Manufacturer Part Number: z8f083a
• Description: High-performance 8-bit Microcontrollers
• Manufacturer: ZiLOG Semiconductor

Oscillator Operation with an External RC Network
PS026308-1207
Figure 23. Connecting the On-Chip Oscillator to an External RC Network
Figure 23
capacitor (RC) network.
An external resistance value of 45 KΩ is recommended for oscillator operation with an
external RC network. The minimum resistance value to ensure operation is 40 KΩ. The
typical oscillator frequency is estimated from the values of the resistor (R in KΩ) and
capacitor (C in pF) elements using the following equation
Figure 24
function of the capacitor (C in pF) employed in the RC network assuming a 45 KΩ
external resistor. For very small values of C, the parasitic capacitance of the oscillator X
pin and the printed circuit board must be included in the estimation of the oscillator
frequency.
Oscillator Frequency (kHz)
displays a recommended configuration for connection with an external resistor-
on page 154 displays the typical (3.3 V and 25
VDD
R
C
=
X
IN
--------------------------------------------------------- -
(
0.4 R C
×
1
×
×10
)
6
+
0
C) oscillator frequency as a
(
Z8 Encore!
4 C
×
Product Specification
)
®
F083A Series
Crystal Oscillator
IN
153