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ATMEGA128A データシート(PDF) 84 Page - ATMEL Corporation

部品番号 ATMEGA128A
部品情報  8-bit Microcontroller with 128Kbytes
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA128A データシート(HTML) 84 Page - ATMEL Corporation

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84
ATmega 128A [DATASHEET]
Atmel-8151I-8-bit-AVR-ATmega128A_Datasheet-08/2014
12.4
Register Description
12.4.1
SFIOR - Special Function IO Register
• 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 65 for more
details about this feature.
12.4.2
PORTA - Port A Data Register
12.4.3
DDRA - Port A Data Direction Register
12.4.4
PINA - Port A Input Pins Address
Table 12-22.
Overriding Signals for Alternate Functions in PG0
Signal Name
PG0/WR
PUOE
SRE
PUOV
0
DDOE
SRE
DDOV
1
PVOE
SRE
PVOV
WR
DIEOE
0
DIEOV
0
DI
–
AIO
–
Bit
7
6
5
4
3
2
1
0
TSM
–
–
–
ACME
PUD
PSR0
PSR321
SFIOR
Read/Write
R/W
R
R
R
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
Bit
76543210
PORTA7
PORTA6
PORTA5
PORTA4
PORTA3
PORTA2
PORTA1
PORTA0
PORTA
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
00000000
Bit
7
6543210
DDA7
DDA6
DDA5
DDA4
DDA3
DDA2
DDA1
DDA0
DDRA
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0000000
Bit
7
6543210
PINA7
PINA6
PINA5
PINA4
PINA3
PINA2
PINA1
PINA0
PINA
Read/Write
R
RRRRR
RR
Initial Value
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A


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