Datasheet

80
ATmega16U4/32U4 [DATASHEET]
Atmel-7766J-USB-ATmega16U4/32U4-Datasheet_04/2016
Note: 1. When enabled, the 2-wire Serial Interface enables Slew-Rate controls on the output pins PD0 and PD1. This is not
shown in this table. In addition, spike filters are connected between the AIO outputs shown in the port figure and the
digital logic of the TWI module.
Table 10-9. Overriding Signals for Alternate Functions PD7..PD4
Signal Name PD7/T0/OC4D/ADC10 PD6/T1/OC4D/ADC9 PD5/XCK1/CTS PD4/ICP1/ADC8
PUOE 0 0 0 0
PUOV 0 0 0 0
DDOE 0 0 XCK1 OUTPUT ENABLE 0
DDOV 0 0 1 0
PVOE 0 0 XCK1 OUTPUT ENABLE 0
PVOV 0 0 XCK1 OUTPUT 0
DIEOE 0 0 0 0
DIEOV 0 0 0 0
DI T0 INPUT T1 INPUT XCK1 INPUT ICP1 INPUT
AIO – – – –
Table 10-10. Overriding Signals for Alternate Functions in PD3..PD0
(1)
Signal Name PD3/INT3/TXD1 PD2/INT2/RXD1 PD1/INT1/SDA PD0/INT0/SCL/OC0B
PUOE TXEN1 RXEN1 TWEN TWEN
PUOV 0 PORTD2 • PUD PORTD1 • PUD PORTD0 • PUD
DDOE TXEN1 RXEN1 TWEN TWEN
DDOV 1 0 SDA_OUT SCL_OUT
PVOE TXEN1 0 TWEN ENABLE TWEN | OC0B ENABLE
PVOV TXD1 0 0 OC0B
DIEOE INT3 ENABLE INT2 ENABLE INT1 ENABLE INT0 ENABLE
DIEOV 1 1 1 1
DI INT3 INPUT INT2 INPUT/RXD1 INT1 INPUT INT0 INPUT
AIO – – SDA INPUT SCL INPUT