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參數資料
| 型號： | ST72321BM |
| 廠商： | 意法半導體 |
| 英文描述： | 80-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C INTERFACE(具有ICP,IAP,Nested Interrupt,TLI,ROP的8位MCU) |
| 中文描述： | 80引腳8位微控制器32至60,000閃存/ ROM，ADC的，5個定時器，SPI和SCI的I2C接口（具有比較方案，國際檢察官聯合會，嵌套中斷，中華語文研習所，人事登記的8位微控制器） |
| 文件頁數： | 24/178頁 |
| 文件大小： | 3121K |
| 代理商： | ST72321BM |
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ST72F321M, ST72321BM
24/178
6.2 MULTI-OSCILLATOR (MO)
The main clock of the ST7 can be generated by
three different source types coming from the multi-
oscillator block:
■
an external source
■
4 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.
Caution:
The OSC1 and/or OSC2 pins must not
be left unconnected. For the purposes of Failure
Mode and Effect Analysis, it should be noted that if
the OSC1 and/or OSC2 pins are left unconnected,
the ST7 main oscillator may start and, in this con-
figuration, could generate an f
OSC
clock frequency
in excess of the allowed maximum (>16MHz.),
putting the ST7 in an unsafe/undefined state. The
product behaviour must therefore be considered
undefined when the OSC pins are left unconnect-
ed.
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.
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 13.1 on page 169
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
This oscillator allows a low cost solution for the
main clock of the ST7 using only an internal resis-
tor and capacitor. Internal RC oscillator mode has
the drawback of a lower frequency accuracy and
should not be used in applications that require ac-
curate timing.
In this mode, 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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