avr - Attempting to program ATmega88PB Atmel Studio error 0xc0 -


i attempting program atmega88pb using atmel studio 7 , both avrisp , atmel ice debugger. when attempting read device id following error message:

failed enter programming mode. ispenterprogmode: error status received: got 0xc0, expected 0x00 (command has failed execute on tool)

this on custom board , tried resolder new chip no success. have read issue may due poor connector or clock frequency being high. tried lowering clock speed 8khz no success.

when pulled out scope found mosi , sck, , reset pins seem sending properly. however, not seeing response miso line (stays high).

does have other ideas attempt debug issue?

many thanks.

just in case else having issue... running off of 3.3v setup did not realize in order enter programming mode vcc must set 4.5v - 5.5v. isolated vcc 3.3v line, applied 5v , works great.


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