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56 page 
56 2503N–AVR–06/08 ATmega32(L) Special Function I/O Register – SFIOR • Bit 2 – PUD: Pull-up disable When this bit is written to one, the pull-ups in the I/O ports are disabled even if the DDxn and PORTxn Registers are configured to enable the pull-ups ({DDxn, PORTxn} = 0b01). See “Con- figuring the Pin” on page 50 for more details about this feature. Alternate Functions of Port A Port A has an alternate function as analog input for the ADC as shown in Table 22. If some Port A pins are configured as outputs, it is essential that these do not switch when a conversion is in progress. This might corrupt the result of the conversion. Bit 7 6 5 4 3 2 1 0 ADTS2 ADTS1 ADTS0 – ACME PUD PSR2 PSR10 SFIOR Read/Write R/W R/W R/W R R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 Table 22. Port A Pins Alternate Functions Port Pin Alternate Function PA7 ADC7 (ADC input channel 7) PA6 ADC6 (ADC input channel 6) PA5 ADC5 (ADC input channel 5) PA4 ADC4 (ADC input channel 4) PA3 ADC3 (ADC input channel 3) PA2 ADC2 (ADC input channel 2) PA1 ADC1 (ADC input channel 1) PA0 ADC0 (ADC input channel 0) Table 23. Overriding Signals for Alternate Functions in PA7..PA4 Signal Name PA7/ADC7 PA6/ADC6 PA5/ADC5 PA4/ADC4 PUOE 000 0 PUOV 000 0 DDOE 0 0 0 0 DDOV 0 0 0 0 PVOE 000 0 PVOV 000 0 DIEOE 000 0 DIEOV 000 0 DI ––– – AIO ADC7 INPUT ADC6 INPUT ADC5 INPUT ADC4 INPUT |
