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ATMEGA16-16MC Datasheet(PDF) 54 Page - ATMEL Corporation

Part No. ATMEGA16-16MC
Description  8-bit AVR Microcontroller with 16K Bytes In-System Programmable Flash
Download  315 Pages
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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ATMEGA16-16MC Datasheet(HTML) 54 Page - ATMEL Corporation

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54
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
7
6
5
4
3
2
1
0
ADTS2
ADTS1
ADTS0
ADHSM
ACME
PUD
PSR2
PSR10
SFIOR
Read/Write
R/W
R/W
R/W
R/W
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
0000
PUOV
0000
DDOE
0000
DDOV
0000
PVOE
0000
PVOV
0000
DIEOE
0000
DIEOV
0000
DI
––––
AIO
ADC7 INPUT
ADC6 INPUT
ADC5 INPUT
ADC4 INPUT


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