ATMEGA2561V ATMEL [ATMEL Corporation], ATMEGA2561V Datasheet - Page 98
ATMEGA2561V
Manufacturer Part Number
ATMEGA2561V
Description
8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.ATMEGA2561V.pdf
(449 pages)
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ATmega640/1280/1281/2560/2561
• INT1/SDA – Port D, Bit 1
INT1, External Interrupt source 1. The PD1 pin can serve as an external interrupt source
to the MCU.
SDA, 2-wire Serial Interface Data: When the TWEN bit in TWCR is set (one) to enable
the 2-wire Serial Interface, pin PD1 is disconnected from the port and becomes the
Serial Data I/O pin for the 2-wire Serial Interface. In this mode, there is a spike filter on
the pin to suppress spikes shorter than 50 ns on the input signal, and the pin is driven by
an open drain driver with slew-rate limitation.
• INT0/SCL – Port D, Bit 0
INT0, External Interrupt source 0. The PD0 pin can serve as an external interrupt source
to the MCU.
SCL, 2-wire Serial Interface Clock: When the TWEN bit in TWCR is set (one) to enable
the 2-wire Serial Interface, pin PD0 is disconnected from the port and becomes the
Serial Clock I/O pin for the 2-wire Serial Interface. In this mode, there is a spike filter on
the pin to suppress spikes shorter than 50 ns on the input signal, and the pin is driven by
an open drain driver with slew-rate limitation.
Table 49 and Table 50 relates the alternate functions of Port D to the overriding signals
shown in Figure 36 on page 89.
Table 49. Overriding Signals for Alternate Functions PD7:PD4
Signal Name
PUOE
PUOV
DDOE
DDOV
PVOE
PVOV
DIEOE
DIEOV
DI
AIO
PD7/T0
0
0
0
0
0
0
0
0
T0 INPUT
–
PD6/T1
0
0
0
0
0
0
0
0
–
T1 INPUT
0
0
XCK1 OUTPUT ENABLE
1
XCK1 OUTPUT ENABLE
XCK1 OUTPUT
0
0
XCK1 INPUT
–
PD5/XCK1
2549K–AVR–01/07
PD4/ICP1
0
0
0
0
0
0
0
0
ICP1 INPUT
–
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