ez80f92 ZiLOG Semiconductor, ez80f92 Datasheet - Page 228
ez80f92
Manufacturer Part Number
ez80f92
Description
Ez80acclaim Flash Microcontrollers
Manufacturer
ZiLOG Semiconductor
Datasheet
1.EZ80F92.pdf
(261 pages)
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PS015313-0508
32 kHz Real-Time Clock Crystal Oscillator Operation
Table 142. Recommended Crystal Oscillator Specifications(20 MHz Operation)
Figure 52
oscillator with an external 32 kHz, fundamental-mode, parallel-resonant crystal. The rec-
ommended crystal specifications are listed in
board layout should add no more than 4 pF of stray capacitance to either the RTC_X
RTC_X
to decrease loading.
An on-chip MOS resistor sets the crystal drive current limit. This configuration does not
require an external bias resistor across the crystal. An on-chip MOS resistor provides the
biasing.
Parameter
Frequency
Resonance
Mode
Series Resistance (R
Load Capacitance (C
Shunt Capacitance (C
Drive Level
Figure 52. Recommended Crystal Oscillator Configuration (32 kHz operation)
OUT
displays a recommended configuration for connecting the Real-Time Clock
pins. If oscillation does not occur, reduce the values of capacitors C
C = 18 pF
2
RTC_X
S
L
0
)
)
)
IN
Value
20
Parallel
Fundamental
25
20
7
1
(Fundamental Mode)
On-Chip Oscillator
32 MHz Crystal
Table 143
Units
MHz
Ω
pF
pF
mΩ
on page 221. A printed circuit
Comments
Maximum
Maximum
Maximum
Maximum
Product Specification
RTC_X
1
C = 18 pF
eZ80F92/eZ80F93
2
OUT
On-Chip Oscillators
1
and C
IN
or
2
220
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