12.07.2015 Views

ATmega32A Datasheet - Sunrom Technologies

ATmega32A Datasheet - Sunrom Technologies

ATmega32A Datasheet - Sunrom Technologies

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<strong>ATmega32A</strong>Figure 26-12. State Machine Sequence for Changing the Instruction Word1Test-Logic-Reset00 Run-Test/Idle1Select-DR Scan1Select-IR Scan1001Capture-DR1Capture-IR00Shift-DR0 Shift-IR 01Exit1-DR1 1Exit1-IR100Pause-DR0 Pause-IR 0110Exit2-DR0Exit2-IR11Update-DRUpdate-IR1 01 026.10.2 AVR_RESET ($C)The AVR specific public JTAG instruction for setting the AVR device in the Reset mode or takingthe device out from the Reset Mode. The TAP controller is not reset by this instruction. The onebit Reset Register is selected as Data Register. Note that the Reset will be active as long asthere is a logic “one” in the Reset Chain. The output from this chain is not latched.The active states are:• Shift-DR: The Reset Register is shifted by the TCK input.26.10.3 PROG_ENABLE ($4)The AVR specific public JTAG instruction for enabling programming via the JTAG port. The 16-bit Programming Enable Register is selected as Data Register. The active states are thefollowing:• Shift-DR: The programming enable signature is shifted into the Data Register.8155C–AVR–02/11286

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