Zilog Z86193 - Manual (Page 39)

Z8
®
CPU
User Manual
UM001604-0108 Clock
32
Simple series capacitance is calculated using the following equation:
Sample calculation for capacitance C
1
and C
2
of 5.83 MHz frequency and inductance
value of 27 µH.
RC Oscillator
In some cases, the Z8
®
CPU features an RC oscillator option. Refer to the specific product
specification for availability. The RC oscillator requires a resistor across XTAL1 and
XTAL2. An additional load capacitor is required from the XTAL1 input to V
SS
pin, see
Figure 21 .
1
=
1
+
1
C
T
C
1
C
2
If C
1
= C
2
1 = 2
C
T
= C
1
C
1
= 2C
T
5.83 (10 6 ) =
1
2 π [2.7 (10 –6 ) C
T
] 1/2
C
T
= 27.6 pF
Therefore, C
1
= 55.2 pF and C
2
= 55.2 pF.
Figure 21. RC Clock
XTAL2
Z8
®
CPU
V
SS
XTAL1
C1
R