Datasheet

17
ATmega8(L)
2486JS–AVR–02/03
Data Sheet Change
Log for ATmega8
This document contains a log on the changes made to the data sheet for ATmega8.
Changes from Rev.
2486B-12/01 to Rev.
2486C-03/02
All page numbers refers to this document.
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 data sheet.
Added the note at the end of the “Bit Rate Generator Unit” on page 166.
Added the description at the end of “Address Match Unit” on page 166.
2 Updated Description of OSCCAL Calibration Byte.
In the data sheet, it was not explained how to take advantage of the calibration
bytes for 2, 4, and 8 MHz Oscillator selections. This is now added in the following
sections:
Improved description of “Oscillator Calibration Register – OSCCAL” on page 29 and
“Calibration Byte” on page 220.
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 24, Table 15 on page 36, Table 16 on page 40, Table 17 on page
42, “DC Characteristics T
A
= -40°C to 85°C, V
CC
= 2.7V to 5.5V (unless otherwise
noted)” on page 236, Table 99 on page 238, and Table 102 on page 240.
4 Updated Programming Figures.
Figure 104 on page 221 and Figure 112 on page 231 are updated to also reflect that
AVCC must be connected during Programming mode.
5 Added a Description on how to Enter Parallel Programming Mode if RESET
Pin is Disabled or if External Oscillators are Selected.
Added a note in section “Enter Programming Mode” on page 223
Changes from Rev.
2486C-03/02 to Rev.
2486D-03/02
All page numbers refers to this document.
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 26,
Table 6, “Start-up Times for the Low-frequency Crystal Oscillator Clock Selection,”
on page 26, Table 8, “Start-up Times for the External RC Oscillator Clock Selec-
tion,” on page 27, and Table 12, “Start-up Times for the External Clock Selection,”
on page 30.
2 Added “ATmega8 Typical Characteristics – Preliminary Data” on page 243.