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ATtiny25/45/85 |
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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 |
0000 |
1000 |
xxxx xxxx |
oooo oooo |
Read Extended Fuse bits. “0” = pro- |
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Read Extended Fuse Bits |
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grammed, “1” = unprogrammed. See |
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Table 22-3 on page 150 for details. |
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Read Calibration Byte |
0011 1000 |
000x |
xxxx |
0000 0000 |
oooo oooo |
Read Calibration Byte |
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1111 0000 |
0000 |
0000 |
xxxx xxxx |
xxxx xxxo |
If o = “1”, a programming operation is |
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Poll RDY/BSY |
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still busy. Wait until this bit returns to |
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“0” before applying another 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
MOSI |
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tOVSH |
tSHOX |
tSLSH |
SCK |
tSHSL |
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MISO |
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tSLIV |
Table 22-11. Serial Programming Characteristics, TA = -40°C to 85°C, VCC = 1.8 - 5.5V (Unless
Otherwise Noted)
Symbol |
Parameter |
Min |
Typ |
Max |
Units |
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1/tCLCL |
Oscillator Frequency (ATtiny25/45/85V) |
0 |
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4 |
MHz |
tCLCL |
Oscillator Period (ATtiny25/45/85V) |
250 |
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ns |
1/tCLCL |
Oscillator Frequency (ATtiny25/45/85L, VCC = 2.7 - |
0 |
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10 |
MHz |
5.5V) |
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tCLCL |
Oscillator Period (ATtiny25/45/85L, VCC = 2.7 - 5.5V) |
100 |
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1/tCLCL |
Oscillator Frequency (ATtiny25/45/85, VCC = 4.5V - |
0 |
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20 |
MHz |
5.5V) |
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tCLCL |
Oscillator Period (ATtiny25/45/85, VCC = 4.5V - 5.5V) |
50 |
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tSHSL |
SCK Pulse Width High |
2 tCLCL* |
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tSLSH |
SCK Pulse Width Low |
2 tCLCL* |
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tOVSH |
MOSI Setup to SCK High |
tCLCL |
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tSHOX |
MOSI Hold after SCK High |
2 tCLCL |
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tSLIV |
SCK Low to MISO Valid |
TBD |
TBD |
TBD |
ns |
Note: 1. |
2 tCLCL for fck < 12 MHz, 3 tCLCL for fck >= 12 MHz |
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157
2586A–AVR–02/05