attiny24v ATMEL Corporation, attiny24v Datasheet - Page 29

• Manufacturer Part Number: attiny24v
• Description: 8-bit Avr Microcontroller With 2/4/8k Bytes Insystem Programmable Flash
• Manufacturer: ATMEL Corporation

8006H–AVR–10/09
Table 6-9.
Notes:
The Oscillator can operate in three different modes, each optimized for a specific frequency
range. The operating mode is selected by fuses CKSEL3..1 as shown in
The CKSEL0 Fuse together with the SUT1..0 Fuses select the start-up times as shown in
6-10.
Table 6-10.
Notes:
CKSEL0
CKSEL3..1
100
0
0
0
0
1
1
1
1
101
110
111
(1)
1. This option should not be used with crystals, only with ceramic resonators.
1. When the BOD has been disabled by software, the wake-up time from sleep mode will be
2. These options should only be used when not operating close to the maximum frequency of the
3. These options are intended for use with ceramic resonators and will ensure frequency stability
approximately 60µs to ensure that the BOD is working correctly before the MCU continues
executing code.
device, and only if frequency stability at start-up is not important for the application. These
options are not suitable for crystals.
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.
SUT1..0
Crystal Oscillator Operating Modes
Start-up Times for the Crystal Oscillator Clock Selection
00
01
10
11
00
01
10
11
Frequency Range (MHz)
Start-up Time from
0.4 - 0.9
0.9 - 3.0
3.0 - 8.0
Power-down
8.0 -
258 CK
258 CK
1K CK
1K CK
1K CK
16K CK
16K CK
16K CK
(3)
(3)
(3)
(2)
(2)
(1)
Additional Delay
14CK + 64 ms
14CK + 64 ms
14CK + 64 ms
14CK + 4 ms
14CK + 4 ms
14CK + 4 ms
from Reset
Recommended C1 and C2 Value (pF)
14CK
14CK
ATtiny24/44/84
12 - 22
12 - 22
12 - 22
Recommended Usage
Ceramic resonator,
fast rising power
Ceramic resonator,
slowly rising power
Ceramic resonator,
BOD enabled
Ceramic resonator,
fast rising power
Ceramic resonator,
slowly rising power
Crystal Oscillator,
BOD enabled
Crystal Oscillator,
fast rising power
Crystal Oscillator,
slowly rising power
–
Table
6-9.
Table
29