參數(shù)資料
型號： IR80C52XXX-12:R
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CQCC44
封裝： LCC-44
文件頁數(shù)： 81/81頁
文件大?。?/td> 663K
9
ATtiny28L/V
1062F–AVR–07/06
Register Description
Oscillator Calibration Register
– OSCCAL
Bits 7..0 – CAL7..CAL0: Oscillator Calibration Value
Writing the calibration byte to this address will trim the internal oscillator to remove pro-
cess variation from the oscillator frequency. When OSCCAL is zero, the lowest available
frequency is chosen. Writing non-zero values to the register will increase the frequency
to the internal oscillator. Writing $FF to the register gives the highest available fre-
quency. Table 2 shows the range for OSCCAL. Note that the oscillator is intended for
calibration to 1.2 MHz, thus tuning to other values is not guaranteed. At 3V and 25
oC,
the pre-programmed calibration byte gives a frequency within ± 1% of the nominal
frequency.
Bit
7654
321
0
$00
CAL7
CAL6
CAL5
CAL4
CAL3
CAL2
CAL1
CAL0
OSCCAL
Read/Write
R/W
Initial Value
0000
000
0
Table 2. Internal RC Oscillator Range
OSCCAL Value
Min Frequency
Max Frequency
0x00
0.6 MHz
1.2 MHz
0x7F
0.8 MHz
1.7 MHz
0xFF
1.2 MHz
2.5 MHz
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