Z8F082ASJ020EG Datasheet, PDF (216/282 Pages) Zilog, Inc. – High-Performance 8-Bit Microcontrollers

Z8 Encore! XP^® F082A Series
Product Specification
199
Note: The stabilization time varies depending on the crystal, resonator or feedback network
used. See Table 115 for transconductance values to compute oscillator stabilization times.
Figure 27 displays a recommended configuration for connection with an external funda-
mental-mode, parallel-resonant crystal operating at 20 MHz. Recommended 20 MHz crys-
tal specifications are provided in Table 114. Printed circuit board layouts must add no
more than 4 pF of stray capacitance to either the X_IN or X_OUT pins. If oscillation does not
occur, reduce the values of capacitors C1 and C2 to decrease loading.
On-Chip Oscillator
X_IN
C1 = 15 pF
Crystal
X_OUT
C2 = 15 pF
Figure 27. Recommended 20 MHz Crystal Oscillator Configuration
PS022827-1212
PRELIMINARY
Crystal Oscillator Operation