ATmega640/1280/1281/2560/2561
• 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 58. Overriding Signals for Alternate Functions in PH7..PH4
Signal Name PH7/T4
PH6/OC2B
PH5/OC4C
PH4/OC4B
PUOE
PUOV
DDOE
DDOV
PVOE
PVOV
PTOE
DIEOE
DIEOV
DI
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
OC2B ENABLE
OC4C ENABLE
OC4B ENABLE
0
OC2B
OC4C
OC4B
–
–
0
0
0
–
–
0
0
0
–
–
0
0
0
–
0
0
T4 INPUT
–
AIO
Table 59. Overriding Signals for Alternate Functions in PH3..PH0
Signal Name PH3/OC4A
PH2/XCK2
PH1/TXD2
TXEN2
0
PH0/RXD2
RXEN2
PUOE
PUOV
DDOE
0
0
0
0
0
PORTH0 • PUD
RXEN2
XCK2 OUTPUT
ENABLE
TXEN2
DDOV
PVOE
0
1
1
0
0
OC4A ENABLE
XCK2 OUTPUT
ENABLE
TXEN2
PVOV
PTOE
DIEOE
DIEOV
DI
OC4A
XCK2
TXD2
0
–
0
0
0
–
–
–
0
0
0
–
–
0
0
0
0
XC2K INPUT
–
RXD2
–
AIO
105
2549A–AVR–03/05
ATMEL [ ATMEL ]
