Rainbow Electronics ATmega8515L - Manual (Page 70)

70
ATmega8515(L)
2512A–AVR–04/02
• RXD – Port D, Bit 0
RXD, Receive Data (Data input pin for USART). When the USART Receiver is enabled
this pin is configured as an input regardless of the value of DDD0. When USART forces
this pin to be an input, the pull-up can still be controlled by the PORTD0 bit.
Table 36 and Table 37 relate the alternate functions of Port D to the overriding signals
shown in Figure 32 on page 61.
Table 36. Overriding Signals for Alternate Functions PD7..PD4
Signal Name PD7/RD PD6/WR PD5/OC1A PD4/XCK
PUOE SRE SRE 0 0
PUOV 0 0 0 0
DDOE SRE SRE 0 0
DDOV 1 1 0 0
PVOE SRE SRE OC1A ENABLE XCK OUTPUT ENABLE
PVOV RD WR OC1A XCK OUTPUT
DIEOE 0 0 0 0
DIEOV 0 0 0 0
DI – – – XCK INPUT
AIO – – – –
Table 37. Overriding Signals for Alternate Functions in PD3..PD0
Signal Name PD3/INT1 PD2/INT0 PD1/TXD PD0/RXD
PUOE 0 0 TXEN0 RXEN0
PUOV 0 0 0 PORTD0 • PUD
DDOE 0 0 TXEN0 RXEN0
DDOV 0 0 1 0
PVOE 0 0 TXEN0 0
PVOV 0 0 TXD 0
DIEOE INT1 ENABLE INT0 ENABLE 0 0
DIEOV 1 1 0 0
DI INT1 INPUT INT0 INPUT – RXD
AIO – – – –