參數(shù)資料
型號： MB9AF311NPMC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, FLASH, 40 MHz, RISC MICROCONTROLLER, PQFP100
封裝： 0.50 MM PITCH, PLASTIC, LQFP-100
文件頁數(shù)： 37/114頁
文件大?。?/td> 1357K
代理商： MB9AF311NPMC
29
ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
The low-frequency crystal oscillator provides an internal load capacitance, see Table 9-8 at each TOSC pin.
The capacitance (Ce + Ci) needed at each TOSC pin can be calculated by using:
C = 2
× CL – CS
where:
●
Ce - is optional external capacitors as described in Figure 9-2 on page 26
●
Ci - is the pin capacitance in Table 9-8
●
CL - is the load capacitance for a 32.768kHz crystal specified by the crystal vendor
●
CS - is the total stray capacitance for one TOSC pin.
Crystals specifying load capacitance (CL) higher than 6pF, require external capacitors applied as described in
The low-frequency crystal oscillator must be selected by setting the CKSEL fuses to “0110” or “0111”, as shown in
Table 9-10. Start-up times are determined by the SUT fuses as shown in Table 9-9.
Table 9-8.
Capacitance for Low-frequency Oscillator
Device
32kHz Osc. Type
Cap(Xtal1/Tosc1)
Cap(Xtal2/Tosc2)
Atmel ATmega48PA/88PA/168PA
System Osc.
18pF
8pF
Timer Osc.
18pF
8pF
Table 9-9.
Start-up Times for the Low-frequency Crystal Oscillator Clock Selection
SUT1...0
Additional Delay from Reset (VCC = 5.0V)
Recommended Usage
00
4 CK
Fast rising power or BOD enabled
01
4 CK + 4.1ms
Slowly rising power
10
4 CK + 65ms
Stable frequency at start-up
11
Reserved
Table 9-10. Start-up Times for the Low-frequency Crystal Oscillator Clock Selection
CKSEL3...0
Start-up Time from
Power-down and Power-save
Recommended Usage
0100(1)
1K CK
0101
32K CK
Stable frequency at start-up
Note:
1.
This option should only be used if frequency stability at start-up is not important for the application
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