ATmega1281R231 Atmel Corporation, ATmega1281R231 Datasheet - Page 78

• Manufacturer Part Number: ATmega1281R231
• Manufacturer: Atmel Corporation

Specifications of ATmega1281R231

• Flash (kbytes): 128 Kbytes
• Max. Operating Frequency: 16 MHz
• Max I/o Pins: 54
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Crypto Engine: AES
• Sram (kbytes): 8
• Eeprom (bytes): 4096
• Operating Voltage (vcc): 1.8 to 3.6
• Timers: 6
• Frequency Band: 2.4 GHz
• Max Data Rate (mb/s): 2
• Antenna Diversity: Yes
• External Pa Control: Yes
• Power Output (dbm): 3
• Receiver Sensitivity (dbm): -101
• Receive Current Consumption (ma): 13.2
• Transmit Current Consumption (ma): 14.4
• Link Budget (dbm): 104

13.3.1
2549N–AVR–05/11
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 13-3.
Table 13-4
signals shown in
Table 13-4.
Note:
DIEOE
DIEOV
Signal
PUOE
DDOE
DDOV
Name
PUOV
PVOE
PVOV
AIO
DI
Port Pin
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
1. ADA is short for ADdress Active and represents the time when address is output. See
and
nal Memory Interface” on page 28
~(WR | ADA
PORTA7 • PUD
OUTPUT • WR
A7 • ADA | D7
Port A Pins Alternate Functions
Overriding Signals for Alternate Functions in PA7:PA4
Table 13-5 on page 79
D7 INPUT
WR | ADA
PA7/AD7
Figure 13-5 on page
SRE
SRE
SRE
0
0
–
(1)
) •
AD7 (External memory interface address and data bit 7)
AD6 (External memory interface address and data bit 6)
AD5 (External memory interface address and data bit 5)
AD4 (External memory interface address and data bit 4)
AD3 (External memory interface address and data bit 3)
AD2 (External memory interface address and data bit 2)
AD1 (External memory interface address and data bit 1)
AD0 (External memory interface address and data bit 0)
ATmega640/1280/1281/2560/2561
PORTA6 • PUD
OUTPUT • WR
~(WR | ADA) •
A6 • ADA | D6
WR | ADA
D6 INPUT
PA6/AD6
76.
relates the alternate functions of Port A to the overriding
SRE
SRE
SRE
0
0
–
for details.
Alternate Function
PORTA5 • PUD
OUTPUT • WR
~(WR | ADA) •
A5 • ADA | D5
WR | ADA
D5 INPUT
PA5/AD5
SRE
SRE
SRE
0
0
–
PORTA4 • PUD
OUTPUT • WR
~(WR | ADA) •
A4 • ADA | D4
D4 INPUT
WR | ADA
PA4/AD4
SRE
SRE
SRE
0
0
–
“Exter-
78