ez80f91 ZiLOG Semiconductor, ez80f91 Datasheet - Page 349

• Manufacturer Part Number: ez80f91
• Description: Ez80 Acclaimplus!? Connectivity Assp Ez80f91 Assp
• Manufacturer: ZiLOG Semiconductor

Table 229. Recommended Crystal Oscillator Specifications—1 MHz Operation
Table 230. Recommended Crystal Oscillator Specifications—10 MHz Operation
PS027001-0707
Parameter
Shunt Capacitance (C
Drive Level
Parameter
Frequency
Resonance
Mode
Series Resistance (R
Load Capacitance (C
Shunt Capacitance (C
Drive Level
32 kHz Real-Time Clock Crystal Oscillator Operation
Figure 64
Time Clock oscillator with an external 32 kHz, fundamental mode, parallel-resonant crys-
tal. The recommended crystal specifications are provided in
printed circuit board layout must not add more than 4 pF of stray capacitance to either the
RTC_X
tors C
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.
(Continued)
S
L
1
0
0
)
)
)
)
and C
IN
on page 342 illustrates a recommended configuration for connecting the Real-
or RTC_X
2
Frequency
Dependent Value
7
1
Frequency
Dependent Value
10
Parallel
Fundamental
35
30
7
1
to decrease loading.
OUT
pins. If oscillation does not occur, reduce the values of capaci-
Units
pF
mW
Units
MHz
Ohms
pF
pF
mW
Comments
Maximum
Maximum
Comments
Maximum
Maximum
Maximum
Maximum
Table
Product Specification
231on page 342. A
On-Chip Oscillators
eZ80F91 ASSP
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