參數(shù)資料
型號： ST72321BM
廠商： 意法半導(dǎo)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(lián)合會，嵌套中斷，中華語文研習(xí)所，人事登記的8位微控制器）
文件頁數(shù)： 143/178頁
文件大小： 3121K
代理商： ST72321BM
ST72F321M, ST72321BM
143/178
CLOCK AND TIMING CHARACTERISTICS
(Cont’d)
11.5.3 Crystal and Ceramic Resonator Oscillators
The ST7 internal clock can be supplied with four
different Crystal/Ceramic resonator oscillators. All
the information given in this paragraph is based on
characterization results with specified typical ex-
ternal components. In the application, the resona-
tor 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 stabiliza-
tion time. Refer to the crystal/ceramic resonator
manufacturer for more details (frequency, pack-
age, accuracy...).
Notes:
1. The oscillator selection can be optimized in terms of supply current using an high quality resonator with small R
S
value.
Refer to crystal/ceramic resonator manufacturer for more details.
2. Data based on characterisation results, not tested in production.
Symbol
Parameter
Conditions
Min
1
>2
>4
>8
20
22
22
18
15
Max
2
4
8
16
40
56
46
33
33
Unit
f
OSC
Oscillator Frequency
1)
LP: Low power oscillator
MP: Medium power oscillator
MS: Medium speed oscillator
HS: High speed oscillator
MHz
R
F
Feedback resistor
2)
k
C
L1
C
L2
Recommended load capacitance ver-
sus equivalent serial resistance of the
crystal or ceramic resonator (R
S
)
R
S
=200
R
S
=200
R
S
=200
R
S
=100
LP oscillator
MP oscillator
MS oscillator
HS oscillator
pF
Symbol
Parameter
Conditions
LP oscillator
MP oscillator
MS oscillator
HS oscillator
Typ
80
160
310
610
Max
150
250
460
910
Unit
i
2
OSC2 driving current
V
DD
=5V
V
IN
=V
SS
μ
A
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