參數(shù)資料
型號: MC80C52EXXX-25/883:D
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CDIP40
封裝: 0.600 INCH, SIDE BRAZED, DIP-40
文件頁數(shù): 97/141頁
文件大?。?/td> 7628K
29
2486AA–AVR–02/2013
ATmega8(L)
least 22pF. By programming the CKOPT Fuse, the user can enable an internal 36pF capacitor
between XTAL1 and GND, thereby removing the need for an external capacitor.
Figure 12. External RC Configuration
The Oscillator can operate in four different modes, each optimized for a specific frequency
range. The operating mode is selected by the fuses CKSEL3..0 as shown in Table 7.
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Note:
1. This option should not be used when operating close to the maximum frequency of the device
Table 7. External RC Oscillator Operating Modes
CKSEL3..0
Frequency Range (MHz)
0101
0.1 - 0.9
0110
0.9 - 3.0
0111
3.0 - 8.0
1000
8.0 - 12.0
Table 8. Start-up Times for the External RC Oscillator Clock Selection
SUT1..0
Start-up Time from
Power-down and
Power-save
Additional Delay
from Reset
(V
CC = 5.0V)
Recommended Usage
00
18 CK
BOD enabled
01
18 CK
4.1ms
Fast rising power
10
18 CK
65ms
Slowly rising power
11
6 CK(1)
4.1ms
Fast rising power or BOD enabled
XTAL2
XTAL1
GND
C
R
VCC
NC
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