Special Function IO Register
| ACME_R | Field ACME reader - Analog Comparator Multiplexer Enable
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| ACME_W | Field ACME writer - Analog Comparator Multiplexer Enable
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| PSR0_R | Field PSR0 reader - Prescaler Reset Timer/Counter0
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| PSR0_W | Field PSR0 writer - Prescaler Reset Timer/Counter0
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| PSR321_R | Field PSR321 reader - Prescaler Reset Timer/Counter3, Timer/Counter2, and Timer/Counter1
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| PSR321_W | Field PSR321 writer - Prescaler Reset Timer/Counter3, Timer/Counter2, and Timer/Counter1
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| PUD_R | Field PUD reader - Pull Up Disable
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| PUD_W | Field PUD writer - Pull Up Disable
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| R | Register SFIOR reader
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| SFIOR_SPEC | Special Function IO Register
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| TSM_R | Field TSM reader - Timer/Counter Synchronization Mode
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| TSM_W | Field TSM writer - Timer/Counter Synchronization Mode
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| W | Register SFIOR writer
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