When the USART2 forces this pin to be an input, a logical on in PORTH0 will turn on the internal
pull-up.
Table 13-24. Overriding Signals for Alternate Functions in PH7:PH4
Signal Name
PUOE
PUOV
DDOE
DDOV
PVOE
PVOV
PTOE
DIEOE
DIEOV
DI
PH7/T4
PH6/OC2B
PH5/OC4C
PH4/OC4B
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 13-25. Overriding Signals for Alternate Functions in PH3:PH0
Signal Name
PUOE
PH3/OC4A
PH2/XCK2
PH1/TXD2
TXEN2
0
PH0/RXD2
RXEN2
0
0
0
0
PUOV
PORTH0 • PUD
XCK2 OUTPUT
DDOE
DDOV
PVOE
0
TXEN2
1
RXEN2
ENABLE
0
1
0
0
XCK2 OUTPUT
OC4A ENABLE
TXEN2
ENABLE
PVOV
PTOE
DIEOE
DIEOV
DI
OC4A
XCK2
TXD2
0
–
0
0
0
–
–
–
0
0
0
–
–
0
0
0
0
XC2K INPUT
RXD2
–
AIO
–
94
ATmega640/1280/1281/2560/2561
2549L–AVR–08/07
ATMEL [ ATMEL ]
