Datasheet

63
2466T–AVR–07/10
ATmega16(L)
Note: 1. When enabled, the Two-wire Serial Interface enables slew-rate controls on the output pins
PC0 and PC1. This is not shown in the figure. In addition, spike filters are connected between
the AIO outputs shown in the port figure and the digital logic of the TWI module.
Alternate Functions of
Port D
The Port D pins with alternate functions are shown in Table 31.
The alternate pin configuration is as follows:
• OC2 – Port D, Bit 7
OC2, Timer/Counter2 Output Compare Match output: The PD7 pin can serve as an external out-
put for the Timer/Counter2 Output Compare. The pin has to be configured as an output (DDD7
set (one)) to serve this function. The OC2 pin is also the output pin for the PWM mode timer
function.
• ICP1 – Port D, Bit 6
ICP1 – Input Capture Pin: The PD6 pin can act as an Input Capture pin for Timer/Counter1.
Table 30. Overriding Signals for Alternate Functions in PC3..PC0
(1)
Signal
Name PC3/TMS PC2/TCK PC1/SDA PC0/SCL
PUOE JTAGEN JTAGEN TWEN TWEN
PUOV 1 1 PORTC1 • PUD PORTC0 • PUD
DDOE JTAGEN JTAG EN TWEN TWE N
DDOV 0 0 SDA_OUT SCL_OUT
PVOE 0 0 TWEN TWEN
PVOV 0 0 0 0
DIEOE JTAGEN JTAGEN 0 0
DIEOV 0 0 0 0
DI – – – –
AIO TMS TCK SDA INPUT SCL INPUT
Table 31. Port D Pins Alternate Functions
Port Pin Alternate Function
PD7 OC2 (Timer/Counter2 Output Compare Match Output)
PD6 ICP1 (Timer/Counter1 Input Capture Pin)
PD5 OC1A (Timer/Counter1 Output Compare A Match Output)
PD4 OC1B (Timer/Counter1 Output Compare B Match Output)
PD3 INT1 (External Interrupt 1 Input)
PD2 INT0 (External Interrupt 0 Input)
PD1 TXD (USART Output Pin)
PD0 RXD (USART Input Pin)