參數資料
型號: M306V5EESP
元件分類: 微控制器/微處理器
英文描述: 16-BIT, OTPROM, 10 MHz, MICROCONTROLLER, PDIP64
封裝: 0.750 INCH, PLASTIC, SDIP-64
文件頁數: 43/152頁
文件大小: 1963K
代理商: M306V5EESP
164
ATtiny25/45/85 [DATASHEET]
2586Q–AVR–08/2013
21.4
Clock Characteristics
21.4.1
Calibrated Internal RC Oscillator Accuracy
It is possible to manually calibrate the internal oscillator to be more accurate than default factory calibration. Please
note that the oscillator frequency depends on temperature and voltage. Voltage and temperature characteristics
Notes:
1. Accuracy of oscillator frequency at calibration point (fixed temperature and fixed voltage).
2. ATtiny25/V, only: 6.4 MHz in ATtiny15 Compatibility Mode.
3. Voltage range for ATtiny25V/45V/85V.
4. Voltage range for ATtiny25/45/85.
21.4.2
External Clock Drive
Figure 21-3. External Clock Drive Waveforms
Table 21-2.
Calibration Accuracy of Internal RC Oscillator
Calibration
Method
Target Frequency
VCC
Temperature
Accuracy at given Voltage
& Temperature (1)
Factory
Calibration
8.0 MHz (2)
3V
25
C±10%
User
Calibration
Fixed frequency within:
6 – 8 MHz
Fixed voltage within:
1.8V - 5.5V (3)
2.7V - 5.5V (4)
Fixed temperature
within:
-40
C to +85C
±1%
VIL1
VIH1
Table 21-3.
External Clock Drive Characteristics
Symbol
Parameter
VCC = 1.8 - 5.5V
VCC = 2.7 - 5.5V
VCC = 4.5 - 5.5V
Units
Min.
Max.
Min.
Max.
Min.
Max.
1/tCLCL
Clock Frequency
0
4
0
10
0
20
MHz
tCLCL
Clock Period
250
100
50
ns
tCHCX
High Time
100
40
20
ns
tCLCX
Low Time
100
40
20
ns
tCLCH
Rise Time
2.0
1.6
0.5
s
tCHCL
Fall Time
2.0
1.6
0.5
s
t
CLCL
Change in period from one clock cycle to the next
2
%
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