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SST89C58 Datasheet

  • SST89C58

  • FlashFlex51 MCU

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FlashFlex51 MCU
SST89C54 / SST89C58
Preliminary Specifications
CLOCK INPUT OPTIONS
Shown in Figure 21 are the input and output of an internal
inverting amplifier (XTAL1, XTAL2), which can be config-
ured for use as an on-chip oscillator.
When driving the device from an external clock source,
XTAL2 should be left disconnected and XTAL1 should
be driven.
At start-up, the external oscillator may encounter a
higher capacitive load at XTAL1 due to interaction be-
tween the amplifier and its feedback capacitance. How-
ever, the capacitance will not exceed 15pF once the
external signal meets the V
IL
and V
IH
specifications.
Recommended Capacitor Values for Crystal
Oscillator
Crystal manufacturer, supply voltage, and other factors
may cause circuit performance to differ from one applica-
tion to another. C1 and C2 should be adjusted appropri-
ately for each design. The table below, shows the typical
values for C1 and C2 at a given frequency. If, following the
satisfactory selection of all external components, the circuit
is still over driven, a series resistor, R
s
, may be added.
R
ECOMMENDED VALUES FOR CRYSTAL OSCILLATOR
Frequency
< 8MHz
8-12MHz
>12MHz
C1 and C2
90-110pF
18-22pF
18-22pF
R
s
(Optional)
200
W
100
W
1
2
3
4
5
6
7
8
200
W
More specific information on On-Chip oscillator design
can be found in
FlashFlex51 Oscillator Circuit Design
Considerations
Application Note.
RS
C2
C1
XTAL2
NC
EXTERNAL
OSCILLATOR
SIGNAL
XTAL2
XTAL1
Vss
9
10
11
XTAL1
Vss
Using the On-Chip Oscillator
External Clock Drive
344 ILL F12.1
12
13
F
IGURE
21: O
SCILLATOR
C
HARACTERISTICS
14
15
16
漏 2000 Silicon Storage Technology, Inc.
37
344-2 8/00

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