ATtiny25/45/85 Auto
Table 22-10. Serial Programming Instruction Set
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Instruction Format |
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Instruction |
Byte 1 |
Byte 2 |
Byte 3 |
Byte4 |
Operation |
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0101 |
0000 |
xxxx |
oooo |
Read Fuse bits. “0” = |
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Read Fuse bits |
0000 |
0000 |
xxxx |
oooo |
programmed, “1” = |
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unprogrammed. See Table |
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22-5 on page 141 for details. |
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0101 |
0000 |
xxxx |
oooo |
Read Fuse High bits. “0” = |
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Read Fuse High bits |
1000 |
1000 |
xxxx |
oooo |
pro-grammed, “1” = |
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unprogrammed. See Table |
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22-4 on page 141 for details. |
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0101 |
0000 |
xxxx |
oooo |
Read Extended Fuse bits. “0” |
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Read Extended Fuse |
0000 |
1000 |
xxxx |
oooo |
= pro-grammed, “1” = |
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Bits |
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unprogrammed. See Table |
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22-3 on page 140 for details. |
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Read Calibration Byte |
0011 |
000x |
0000 |
oooo |
Read Calibration Byte |
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1000 |
xxxx |
0000 |
oooo |
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1111 |
0000 |
xxxx |
xxxx |
If o = “1”, a programming |
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0000 |
0000 |
xxxx |
xxxo |
operation is still busy. Wait |
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Poll RDY/BSY |
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until this bit returns to “0” |
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before applying another |
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command. |
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Note: a = address high bits, b = address low bits, H = 0 - Low byte, 1 - High Byte, o = data out, i = data in, x = don’t care
22.6.2Serial Programming Characteristics
Figure 22-3. Serial Programming Timing
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MOSI |
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tOVSH |
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tSHOX |
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tSLSH |
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SCK |
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tSHSL |
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MISO |
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tSLIV |
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Table 22-11. Serial Programming Characteristics, TA = -40°C to 125°C, VCC = 2.7 - 5.5V |
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(Unless Otherwise Noted) |
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Symbol |
Parameter |
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Min |
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Typ |
Max |
Units |
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1/tCLCL |
Oscillator Frequency (ATtiny25/45/85V) |
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0 |
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4 |
MHz |
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tCLCL |
Oscillator Period (ATtiny25/45/85V) |
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250 |
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ns |
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1/tCLCL |
Oscillator Frequency (ATtiny25/45/85L, VCC = 2.7 - |
0 |
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10 |
MHz |
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5.5V) |
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tCLCL |
Oscillator Period (ATtiny25/45/85L, VCC = 2.7 - |
100 |
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ns |
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5.5V) |
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147
7598C–AVR–09/06