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ATtiny45 Datasheet(PDF) 143 Page - ATMEL Corporation |
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ATtiny45 Datasheet(HTML) 143 Page - ATMEL Corporation |
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143 / 196 page  143 7598H–AVR–07/09 ATtiny25/45/85 Figure 21-4. High-voltage Serial Programming Table 21-12. Pin Name Mapping Signal Name in High-voltage Serial Programming Mode Pin Name I/O Function SDI PB0 I Serial Data Input SII PB1 I Serial Instruction Input SDO PB2 O Serial Data Output SCI PB3 I Serial Clock Input (min. 220ns period) Table 21-13. High-voltage Serial Programming Characteristics T A = 25°C ±10%, VCC = 5.0V ±10% (Unless otherwise noted) Symbol Parameter Min Typ Max Units tSHSL SCI (PB3) Pulse Width High 125 ns tSLSH SCI (PB3) Pulse Width Low 125 ns tIVSH SDI (PB0), SII (PB1) Valid to SCI (PB3) High 50 ns tSHIX SDI (PB0), SII (PB1) Hold after SCI (PB3) High 50 ns tSHOV SCI (PB3) High to SDO (PB2) Valid 16 ns tWLWH_PFB Wait after Instr. 3 for Write Fuse Bits 2.5 ms Table 21-14. Pin Values Used to Enter Programming Mode Pin Symbol Value SDI Prog_enable[0] 0 SII Prog_enable[1] 0 SDO Prog_enable[2] 0 |
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