Datasheet

108
ATmega640/1280/1281/2560/2561
2549K–AVR–01/07
• RXD2 – Port H, Bit 0
RXD2, USART2 Receive pin: Receive Data (Data input pin for the USART2). When the
USART2 Receiver is enabled, this pin is configured as an input regardless of the value
of DDH0. When the USART2 forces this pin to be an input, a logical on in PORTH0 will
turn on the internal pull-up.
Table 61. Overriding Signals for Alternate Functions in PH7:PH4
Signal Name PH7/T4 PH6/OC2B PH5/OC4C PH4/OC4B
PUOE0 000
PUOV0 000
DDOE 0 0 0 0
DDOV 0 0 0 0
PVOE 0 OC2B ENABLE OC4C ENABLE OC4B ENABLE
PVOV 0 OC2B OC4C OC4B
PTOE– –––
DIEOE0 000
DIEOV0 000
DI T4 INPUT000
AIO– –––
Table 62. Overriding Signals for Alternate Functions in PH3:PH0
Signal Name PH3/OC4A PH2/XCK2 PH1/TXD2 PH0/RXD2
PUOE 0 0 TXEN2RXEN2
PUOV0 00PORTH0 • PUD
DDOE 0 XCK2 OUTPUT
ENABLE
TXEN2RXEN2
DDOV 0 1 1 0
PVOE OC4A ENABLE XCK2 OUTPUT
ENABLE
TXEN20
PVOV OC4A XCK2 TXD2 0
PTOE– –––
DIEOE0 000
DIEOV0 000
DI 0 XC2K INPUT 0 RXD2
AIO– –––