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ATmega169P 데이터시트(PDF) 35 Page - ATMEL Corporation

부품명 ATmega169P
상세설명  8-bit Microcontroller with 16K Bytes In-System Programmable Flash
PDF  393 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega169P 데이터시트(HTML) 35 Page - ATMEL Corporation

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35
8018N–AVR–08/09
ATmega169P
where CL is the load capacitance for a 32.768 kHz crystal specified by the crystal vendor and C
S
is the total stray capacitance for one TOSC pin.
Crystals specifying load capacitance (CL) higher than 6 pF, require external capacitors applied
as described in Figure 8-2 on page 33.
To find suitable load capacitance for a 32.768 kHz crystal, please consult the crystal datasheet.
The Low-frequency Crystal Oscillator must be selected by setting the CKSEL Fuses to “0110” or
“0111” as shown in Table 8-9. Start-up times are determined by the SUT Fuses as shown in
Table 8-8.
Note:
1. This option should only be used if frequency stability at start-up is not important for the
application
Table 8-8.
Start-up Times for the Low-frequency Crystal Oscillator Clock Selection
SUT1..0
Additional Delay from Reset (VCC = 5.0V)
Recommended Usage
00
14 CK
Fast rising power or BOD enabled
01
14 CK + 4 ms
Slowly rising power
10
14 CK + 65 ms
Stable frequency at start-up
11
Reserved
Table 8-9.
Start-up Times for the Low-frequency Crystal Oscillator Clock Selection
CKSEL3..0
Start-up Time from
Power-down and Power-save
Recommended Usage
0110(1)
1K CK
0111
32K CK
Stable frequency at start-up
C
2
CL
⋅
Cs
–
=



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