ez80l92 ZiLOG Semiconductor, ez80l92 Datasheet - Page 204

• Manufacturer Part Number: ez80l92
• Description: Ez80acclaim Flash Microcontrollers
• Manufacturer: ZiLOG Semiconductor

On-Chip Oscillators
PS013014-0107
20 MHz Primary Crystal Oscillator Operation
The eZ80L92 MCU features two on-chip oscillators for use with an external crystal.
The primary oscillator generates the system clock for the internal CPU and for the major-
ity of the on-chip peripherals. Alternatively, the X
clock input signal. If an external clock generator is used, the X
disconnected. The secondary oscillator can drive a 32 kHz crystal to generate the
time-base for the real time clock.
Figure 44
20 MHz, fundamental-mode, and parallel-resonant crystal.
crystal specifications. Resistor R
circuit board layout must add not more than 4 pF of stray capacitance to either the X
X
decrease loading.
Figure 44. Recommended Crystal Oscillator Configuration (20 MHz operation)
C = 22 pF
2
OUT
pins. If oscillation does not occur, reduce the values of capacitors C
X
IN
illustrates a recommended configuration for connection with an external
(Fundamental Mode)
On-Chip Oscillator
20 MHz Crystal
R = 100 K‰
2
1
limits total power dissipation by the crystal. Printed
IN
X
R = 220 ‰
input pin can accept a CMOS-level
OUT
1
C = 22 pF
2
Table 116
OUT
Product Specification
pin must be left
lists recommended
On-Chip Oscillators
eZ80L92 MCU
1
and C
2
to
IN
or
198