ATMEGA8515L8AU

Manufacturer Part NumberATMEGA8515L8AU
DescriptionTQFP44
ManufacturerATMEL Corporation
ATMEGA8515L8AU datasheet
 

Specifications of ATMEGA8515L8AU

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Low-frequency Crystal
Oscillator
2512J–AVR–10/06
Table 8. Start-up Times for the Crystal Oscillator Clock Selection (Continued)
Start-up Time
CKSEL0
SUT1..0
from Power-down
1
01
16K CK
1
10
16K CK
1
11
16K CK
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
Start-up Time
Additional Delay from
SUT1..0
from Power-down
(1)
00
1K CK
(1)
01
1K CK
10
32K CK
11
Note:
1. These options should only be used if frequency stability at start-up is not important
for the application.
ATmega8515(L)
Additional Delay from
Recommended
Reset (V
= 5.0V)
Usage
CC
Crystal Oscillator,
BOD enabled
4.1 ms
Crystal Oscillator, fast
rising power
65 ms
Crystal Oscillator,
slowly rising power
Reset (V
= 5.0V)
Recommended Usage
CC
4.1 ms
Fast rising power or BOD
enabled
65 ms
Slowly rising power
65 ms
Stable frequency at start-up
Reserved
37