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ATMEGA1280 データシート(PDF) 88 Page - ATMEL Corporation

部品番号 ATMEGA1280
部品情報  8- BIT Microcontroller with 256K Bytes In-System Programmable Flash
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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

ATMEGA1280 データシート(HTML) 88 Page - ATMEL Corporation

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88
ATmega640/1280/1281/2560/2561
2549A–AVR–03/05
MCU Control Register –
MCUCR
• Bit 4 – 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 82 for more details about this feature.
Alternate Functions of Port A
The Port A has an alternate function as the address low byte and data lines for the
External Memory Interface.
Table 37 and Table 38 relates the alternate functions of Port A to the overriding signals
shown in Figure 37 on page 86.
Note:
1. ADA is short for ADdress Active and represents the time when address is output. See
“External Memory Interface” on page 29 for details.
Bit
7
6
5
4
3
2
1
0
JTD
–PUD
IVSEL
IVCE
MCUCR
Read/Write
R/W
R
R
R/W
R
R
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
Table 36. Port A Pins Alternate Functions
Port Pin
Alternate Function
PA7
AD7 (External memory interface address and data bit 7)
PA6
AD6 (External memory interface address and data bit 6)
PA5
AD5 (External memory interface address and data bit 5)
PA4
AD4 (External memory interface address and data bit 4)
PA3
AD3 (External memory interface address and data bit 3)
PA2
AD2 (External memory interface address and data bit 2)
PA1
AD1 (External memory interface address and data bit 1)
PA0
AD0 (External memory interface address and data bit 0)
Table 37. Overriding Signals for Alternate Functions in PA7..PA4
Signal
Name
PA7/AD7
PA6/AD6
PA5/AD5
PA4/AD4
PUOE
SRE
SRE
SRE
SRE
PUOV
~(WR | ADA(1)) •
PORTA7 • PUD
~(WR | ADA) •
PORTA6 • PUD
~(WR | ADA) •
PORTA5 • PUD
~(WR | ADA) •
PORTA4 • PUD
DDOE
SRE
SRE
SRE
SRE
DDOV
WR | ADA
WR | ADA
WR | ADA
WR | ADA
PVOE
SRE
SRE
SRE
SRE
PVOV
A7 • ADA | D7
OUTPUT • WR
A6 • ADA | D6
OUTPUT • WR
A5 • ADA | D5
OUTPUT • WR
A4 • ADA | D4
OUTPUT • WR
DIEOE
0
0
0
0
DIEOV
0
0
0
0
DI
D7 INPUT
D6 INPUT
D5 INPUT
D4 INPUT
AIO


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