Datasheet

64
ATmega8535(L)
2502K–AVR–10/06
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 con-
nected 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 32.
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 output 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.
• OC1A – Port D, Bit 5
OC1A, Output Compare Match A output: The PD5 pin can serve as an external output
for the Timer/Counter1 Output Compare A. The pin has to be configured as an output
Table 31. Overriding Signals for Alternate Functions in PC1..PC0
(1)
Signal Name PC1/SDA PC0/SCL
PUOE TWEN TWEN
PUOV PORTC1 • PUD PORTC0 • PUD
DDOE TWEN TWEN
DDOV SDA_OUT SCL_OUT
PVOE TWEN TWEN
PVOV 0 0
DIEOE 0 0
DIEOV 0 0
DI – –
AIO SDA INPUT SCL INPUT
Table 32. 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)