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参数资料
型号： TSC80C31-25IDD
厂商： ATMEL CORP
元件分类： 微控制器/微处理器
英文描述： 8-BIT, 25 MHz, MICROCONTROLLER, PQFP44
封装： PLASTIC, QFP-44
文件页数： 120/132页
文件大小： 10886K
代理商： TSC80C31-25IDD
325
2486AA–AVR–02/2013
ATmega8(L)
Changes from Rev.
2486C-03/02 to
Rev. 2486D-03/02
1.
Updated Typical Start-up Times.
The following tables has been updated:
Table 5, “Start-up Times for the Crystal Oscillator Clock Selection,” on page 28, Table 6,
“Start-up Times for the Low-frequency Crystal Oscillator Clock Selection,” on page 28,
Table 8, “Start-up Times for the External RC Oscillator Clock Selection,” on page 29, and
Table 12, “Start-up Times for the External Clock Selection,” on page 32.
2.
Added “ATmega8 Typical Characteristics – TA = -40°C to 85°C” on page 244.
Changes from Rev.
2486B-12/01 to
Rev. 2486C-03/02
1.
Updated TWI Chapter.
More details regarding use of the TWI Power-down operation and using the TWI as Master
with low TWBRR values are added into the datasheet.
Added the note at the end of the “Bit Rate Generator Unit” on page 164.
Added the description at the end of “Address Match Unit” on page 164.
2.
Updated Description of OSCCAL Calibration Byte.
In the datasheet, it was not explained how to take advantage of the calibration bytes for 2, 4,
and 8MHz Oscillator selections. This is now added in the following sections:
Improved description of “Oscillator Calibration Register – OSCCAL” on page 31 and “Cali-
bration Byte” on page 218.
3.
Added Some Preliminary Test Limits and Characterization Data.
Removed some of the TBD’s in the following tables and pages:
Table 3 on page 26, Table 15 on page 38, Table 16 on page 42, Table 17 on page 44, “TA =
-40°C to +85°C, VCC = 2.7V to 5.5V (unless otherwise noted)” on page 235, Table 99 on
page 237, and Table 102 on page 239.
4.
Updated Programming Figures.
Figure 104 on page 219 and Figure 112 on page 230 are updated to also reflect that AV
CC
must be connected during Programming mode.
5.
Added a Description on how to Enter Parallel Programming Mode if RESET Pin is Dis-
abled or if External Oscillators are Selected.
Added a note in section “Enter Programming Mode” on page 221.
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