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| 型號(hào)： | IR80C52TXXX-16SHXXX:RD |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQCC44 |
| 文件頁(yè)數(shù)： | 103/182頁(yè) |
| 文件大?。?/td> | 2994K |
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27
1477K–AVR–08/10
ATtiny26(L)
The CKSEL0 Fuse together with the SUT1..0 Fuses select the start-up times as shown in Table
Notes: 1. These options should only be used when not operating close to the maximum frequency of the
device, and only if frequency stability at start-up is not important for the application.
2. These options are intended for use with ceramic resonators and will ensure frequency stability
at start-up. They can also be used with crystals when not operating close to the maximum fre-
quency of the device, and if frequency stability at start-up is not important for the application.
Low-frequency
Crystal Oscillator
To use a 32.768 kHz watch crystal as the clock source for the device, the Low-frequency Crystal
Oscillator must be selected by setting the PLLCK to “1” and CKSEL Fuses to “1001”. The crystal
should be connected as shown in Figure 22. By programming the CKOPT Fuse, the user can
enable internal capacitors on XTAL1 and XTAL2, thereby removing the need for external capac-
itors. The internal capacitors have a nominal value of 36 pF.
When this oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Note:
1. These options should only be used if frequency stability at start-up is not important for the
application.
Table 7. Start-up Times for the Crystal Oscillator Clock Selection
CKSEL0
SUT1..0
Start-up Time
from Power-down
Additional Delay from
Reset (VCC = 5.0V)
Recommended
Usage
0
00
258 CK(1)
4.1 ms
Ceramic resonator,
fast rising power
0
01
258 CK(1)
65 ms
Ceramic resonator,
slowly rising power
010
1K CK(2)
–
Ceramic resonator,
BOD enabled
011
1K CK(2)
4.1 ms
Ceramic resonator,
fast rising power
100
1K CK(2)
65 ms
Ceramic resonator,
slowly rising power
1
01
16K CK
–
Crystal Oscillator,
BOD enabled
1
10
16K CK
4.1 ms
Crystal Oscillator, fast
rising power
1
11
16K CK
65 ms
Crystal Oscillator,
slowly rising power
Table 8. Start-up Times for the Low-frequency Crystal Oscillator Clock Selection
SUT1..0
Start-up Time
from Power-down
Additional Delay from
Reset (VCC = 5.0V)
Recommended Usage
00
1K CK(1)
4.1 ms
Fast rising power or BOD enabled
01
1K CK(1)
65 ms
Slowly rising power
10
32K CK
65 ms
Stable frequency at start-up
11
Reserved
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