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ATMEGA8515-16JI(2010) View Datasheet(PDF) - Atmel Corporation

Part Name
Description
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ATMEGA8515-16JI
(Rev.:2010)
Atmel
Atmel Corporation Atmel
ATMEGA8515-16JI Datasheet PDF : 257 Pages
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ATmega8515(L)
Low-frequency Crystal
Oscillator
Table 8. Start-up Times for the Crystal Oscillator Clock Selection (Continued)
CKSEL0
1
SUT1..0
01
Start-up Time
from Power-down
16K CK
Additional Delay from
Reset (VCC = 5.0V)
Recommended
Usage
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
Notes:
1. These options should only be used when not operating close to the maximum fre-
quency of the device, and only if frequency stability at start-up is not important for the
application. These options are not suitable for crystals.
2. These options are intended for use with ceramic resonators and will ensure fre-
quency stability at start-up. They can also be used with crystals when not operating
close to the maximum frequency of the device, and if frequency stability at start-up is
not important for the application.
To use a 32.768 kHz watch crystal as the clock source for the device, the Low-fre-
quency Crystal Oscillator must be selected by setting the CKSEL Fuses to “1001”. The
crystal should be connected as shown in Figure 19. By programming the CKOPT Fuse,
the user can enable internal capacitors on XTAL1 and XTAL2, thereby removing the
need for external capacitors. 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 Table 9.
Table 9. Start-up Times for the Low-frequency Crystal Oscillator Clock Selection
SUT1..0
00
01
10
11
Start-up Time
from Power-down
1K CK(1)
1K CK(1)
32K CK
Additional Delay from
Reset (VCC = 5.0V)
4.1 ms
65 ms
65 ms
Reserved
Recommended Usage
Fast rising power or BOD
enabled
Slowly rising power
Stable frequency at start-up
Note: 1. These options should only be used if frequency stability at start-up is not important
for the application.
37
2512K–AVR–01/10
 

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