ATMEGA640 Datasheet, PDF (105/407 Pages) ATMEL Corporation – 8- BIT Microcontroller with 256K Bytes In-System Programmable Flash

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