TINY12 ATMEL [ATMEL Corporation], TINY12 Datasheet - Page 20

• Manufacturer Part Number: TINY12
• Description: 8-bit AVR Microcontroller with 1K Byte Flash
• Manufacturer: ATMEL [ATMEL Corporation]

20
ATtiny11/12
Table 9. ATtiny12 Clock Options and Start-up Times
Note:
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
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.
CKSEL3..0
BODLEVEL
Unprogrammed
Unprogrammed
Programmed
Programmed
1111
1110
1101
1100
1011
1010
1001
1000
0111
0110
0101
0100
0011
0010
0001
0000
1. Due to the limited number of clock cycles in the start-up period, it is recommended
that Ceramic Resonator be used.
Clock Source
Ext. Crystal/Ceramic Resonator
Ext. Crystal/Ceramic Resonator
Ext. Crystal/Ceramic Resonator
Ext. Crystal/Ceramic Resonator
Ext. Crystal/Ceramic Resonator
Ext. Crystal/Ceramic Resonator
Ext. Low-frequency Crystal
Ext. Low-frequency Crystal
Ext. RC Oscillator
Ext. RC Oscillator
Ext. RC Oscillator
Int. RC Oscillator
Int. RC Oscillator
Int. RC Oscillator
Ext. Clock
Ext. Clock
3.6 ms (at V
4.2 ms (at V
57 ms (at V
67 ms (at V
Time-out
cc
cc
cc
cc
(1)
(1)
(1)
= 1.8V)
= 2.7V)
= 1.8V)
= 2.7V)
Start-up Time,
V
BODLEVEL
Unprogrammed
1K CK
3.6 ms + 1K CK
57 ms 1K CK
6 CK
3.6 ms + 6 CK
6 CK
3.6 ms + 6 CK
6 CK
3.6 ms + 6 CK
16K CK
3.6 ms + 16K CK
57 ms + 16K CK
57 ms + 1K CK
57 ms + 32K CK
57 ms + 6 CK
57 ms + 6 CK
CC
= 1.8V,
Number of Cycles
Start-up Time,
V
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
4.2 ms + 6 CK
67 ms + 6 CK
6 CK
4.2 ms + 6 CK
67 ms + 6 CK
6 CK
4.2 ms + 6 CK
CC
16K
256
4K
1K
= 2.7V,
1006D–AVR–07/03