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| 型號(hào)： | ST7FLITE19F1M6 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | CLUSTER PANEL,RJ-11 W/ (12) 4- |
| 中文描述： | 8位單電壓閃存存儲(chǔ)器，數(shù)據(jù)EEPROM，模數(shù)轉(zhuǎn)換器，4定時(shí)器，微控制器的SPI |
| 文件頁(yè)數(shù)： | 26/131頁(yè) |
| 文件大?。?/td> | 2046K |
| 代理商： | ST7FLITE19F1M6 |
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ST7LITE1
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7.4 MULTI-OSCILLATOR (MO)
The main clock of the ST7 can be generated by
four different source types coming from the multi-
oscillator block (1 to 16MHz or 32kHz):
■
an external source
■
5 crystal or ceramic resonator oscillators
■
an internal high frequency RC oscillator
Each oscillator is optimized for a given frequency
range in terms of consumption and is selectable
through the option byte. The associated hardware
configurations are shown in
Table 4
. Refer to the
electrical characteristics section for more details.
External Clock Source
In this external clock mode, a clock signal (square,
sinus or triangle) with ~50% duty cycle has to drive
the OSC1 pin while the OSC2 pin is tied to ground.
Note:
when the Multi-Oscillator is not used, PB4 is
selected by default as external clock.
Crystal/Ceramic Oscillators
This family of oscillators has the advantage of pro-
ducing a very accurate rate on the main clock of
the ST7. The selection within a list of 4 oscillators
with different frequency ranges has to be done by
option byte in order to reduce consumption (refer
to
section 15.1 on page 121
for more details on the
frequency ranges). In this mode of the multi-oscil-
lator, the resonator and the load capacitors have
to be placed as close as possible to the oscillator
pins in order to minimize output distortion and
start-up stabilization time. The loading capaci-
tance values must be adjusted according to the
selected oscillator.
These oscillators are not stopped during the
RESET phase to avoid losing time in the oscillator
start-up phase.
Internal RC Oscillator
In this mode, the tunable 1%RC oscillator is used
as main clock source. The two oscillator pins have
to be tied to ground.
Table 4. ST7 Clock Sources
Hardware Configuration
E
C
I
OSC1
OSC2
EXTERNAL
SOURCE
ST7
OSC1
OSC2
LOAD
CAPACITORS
ST7
C
L2
C
L1
OSC1
OSC2
ST7
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