Atmega128, is the SCK line always a input to the MCU when...

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#1
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Is the SCK line always an MCU input when you are programming the MCU with a AVRISP programmer unit?
or does it work bi-directionally between the MCU and AVRISP unit?
Thanks
Earl

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During SPI serial programming the SCK line is always an input. Refer to Table 128 in the datasheet.

Dave

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Thanks, I just wanted to be sure.