ATTINY12(2003) 查看數據表（PDF） - Atmel Corporation
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ATTINY12 Datasheet PDF : 91 Pages
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Table 9. ATtiny12 Clock Options and Start-up Times
CKSEL3..0
1111
1110
1101
1100
1011
1010
1001
1000
0111
Clock Source
Ext. Crystal/Ceramic Resonator(1)
Ext. Crystal/Ceramic Resonator(1)
Ext. Crystal/Ceramic Resonator(1)
Ext. Crystal/Ceramic Resonator
Ext. Crystal/Ceramic Resonator
Ext. Crystal/Ceramic Resonator
Ext. Low-frequency Crystal
Ext. Low-frequency Crystal
Ext. RC Oscillator
Start-up Time,
VCC = 1.8V,
BODLEVEL
Unprogrammed
1K CK
3.6 ms + 1K CK
57 ms 1K CK
16K CK
3.6 ms + 16K CK
57 ms + 16K CK
57 ms + 1K CK
57 ms + 32K CK
6 CK
Start-up Time,
VCC = 2.7V,
BODLEVEL
Programmed
1K CK
4.2 ms + 1K CK
67 ms + 1K CK
16K CK
4.2 ms + 16K CK
67 ms + 16K CK
67 ms + 1K CK
67 ms + 32K CK
6 CK
0110
0101
Ext. RC Oscillator
Ext. RC Oscillator
3.6 ms + 6 CK
57 ms + 6 CK
4.2 ms + 6 CK
67 ms + 6 CK
0100
0011
Int. RC Oscillator
Int. RC Oscillator
6 CK
3.6 ms + 6 CK
6 CK
4.2 ms + 6 CK
0010
0001
Int. RC Oscillator
Ext. Clock
57 ms + 6 CK
6 CK
67 ms + 6 CK
6 CK
0000
Ext. Clock
3.6 ms + 6 CK
4.2 ms + 6 CK
Note: 1. Due to the limited number of clock cycles in the start-up period, it is recommended
that Ceramic Resonator be used.
This table shows the start-up times from reset. From sleep, only the clock counting part
of the start-up time is used. The Watchdog oscillator is used for timing the real-time part
of the start-up time. The number of WDT oscillator cycles used for each time-out is
shown in Table 10.
Table 10. Number of Watchdog Oscillator Cycles
BODLEVEL
Unprogrammed
Unprogrammed
Programmed
Programmed
Time-out
3.6 ms (at Vcc = 1.8V)
57 ms (at Vcc = 1.8V)
4.2 ms (at Vcc = 2.7V)
67 ms (at Vcc = 2.7V)
Number of Cycles
256
4K
1K
16K
The frequency of the watchdog oscillator is voltage dependent as shown in the section
“ATtiny11 Typical Characteristics” on page 60.
Note that the BODLEVEL fuse can be used to select start-up times even if the Brown-
out Detection is disabled (by leaving the BODEN fuse unprogrammed).
The device is shipped with CKSEL3..0 = 0010.
20 ATtiny11/12
1006D–AVR–07/03
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