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ATmega16-16PU Arkusz danych(PDF) 57 Page - ATMEL Corporation

Numer części ATmega16-16PU
Szczegółowy opis  8-bit Microcontroller with 16K Bytes In-Syustem Programmable Flash
Download  357 Pages
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Producent  ATMEL [ATMEL Corporation]
Strona internetowa  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega16-16PU Arkusz danych(HTML) 57 Page - ATMEL Corporation

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2466S–AVR–05/09
ATmega16(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 51 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 55.
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


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