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Atmel AVR 'Classic' Microcontroller Family - Timing
Characteristics
Voltage
Flash Write
(V)
Time (ms)
3.0
6
3.3
5
3.5
4
4.0
4
4.5
3
5.0
3
5.5
2
6.0
2
• For the Classic AVR and ATtiny family, it is only necessary to alter the 'FLASH/EEPROM
write times' depending on the target voltage.
• Erasing of the target device is not guaranteed below 3.4V. This can cause programming
errors as random locations may not have erased correctly. This is a silicon limitation for
which there is currently no workaround.
ATMega103/103L - Timing Characteristics
Voltage
Flash Write
(V)
Time (ms)
3.8
45
4.0
35
4.5
30
5.0
22
• For the ATmega family, it is necessary to alter the 'FLASH write time' on a per page (256
bytes) basis and the 'EEPROM Write time' on a byte-by-byte basis depending on the target
voltage.
• Erasing of the target device is not guaranteed below 3.4V. This can cause programming
errors as random locations may not have erased correctly. This is a silicon limitation for
which there is currently no workaround.
• Correct programming of ATmega103L devices at voltages less than 3.8V with revision 'K'
silicon was found to be unreliable.
• The Micro-ISP Series IV LV' programmer is slower at programming
the ATmega103 than the +5V programmer at a given voltage.
Micro-ISP
Device Programming Guide continued
EEPROM Write
Time (ms)
6
5
4
4
3
3
2
2
EEPROM Write
Time (ms)
7
7
5
4
IV User Manual V2.03
Series
F SPI
F OSC
(KHZ)
(MHz)
70
3.6864
70
3.6864
70
3.6864
70
3.6864
70
3.6864
70
8
70
8
70
8
F SPI
F OSC
(KHZ)
(MHz)
70
3.6864
70
3.6864
70
3.6864
70
3.6864
14
Code time
Data time
(secs)
(secs)
65.0
4.0
56.0
3.5
48.0
3.0
48.0
3.0
39.0
2.5
39.0
2.5
30.0
1.9
30.0
1.9
Code time
Data time
(secs)
(secs)
231.1
38
226.1
38
223.4
30
219.2
25
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