ATmega16 datasheet(54/315 Pages) ATMEL

54 / 315 page

ATmega16(L)

2466E–AVR–10/02

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 “Configuring the Pin” on page 48 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.

Table 23 and Table 24 relate the alternate functions of Port A to the overriding signals

shown in Figure 26 on page 52.

Bit

ADTS2

ADTS1

ADTS0

ADHSM

ACME

PUD

PSR2

PSR10

SFIOR

Read/Write

R/W

Initial Value

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

0000

PUOV

0000

DDOE

0000

DDOV

0000

PVOE

0000

PVOV

0000

DIEOE

0000

DIEOV

0000

––––

AIO

ADC7 INPUT

ADC6 INPUT

ADC5 INPUT

ADC4 INPUT

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