ATTINY13V_0701 Datasheet, PDF (95/177 Pages) ATMEL Corporation – 8-bit Microcontroller with 1K Bytes In-System Programmable Flash

ATtiny13
When this bit is written logic one, the digital input buffer on the corresponding ADC pin is
disabled. The corresponding PIN register bit will always read as zero when this bit is set.
When an analog signal is applied to the ADC3..0 pin and the digital input from this pin is
not needed, this bit should be written logic one to reduce power consumption in the dig-
ital input buffer.
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2535G–AVR–01/07