ATMEGA8535L datasheet(63/321 Pages) ATMEL

63 / 321 page

ATmega8535(L)

2502K–AVR–10/06

TOSC2, Timer Oscillator pin 2: When the AS2 bit in ASSR is set (one) to enable asyn-

chronous clocking of Timer/Counter2, pin PC7 is disconnected from the port, and

becomes the inverting output of the Oscillator amplifier. In this mode, a crystal Oscillator

is connected to this pin, and the pin can not be used as an I/O pin.

• TOSC1 – Port C, Bit 6

TOSC1, Timer Oscillator pin 1: When the AS2 bit in ASSR is set (one) to enable asyn-

chronous clocking of Timer/Counter2, pin PC6 is disconnected from the port, and

becomes the input of the inverting Oscillator amplifier. In this mode, a crystal Oscillator

is connected to this pin, and the pin can not be used as an I/O pin.

• SDA – Port C, Bit 1

SDA, Two-wire Serial Interface Data: When the TWEN bit in TWCR is set (one) to

enable the Two-wire Serial Interface, pin PC1 is disconnected from the port and

becomes the Serial Data I/O pin for the Two-wire Serial Interface. In this mode, there is

a spike filter on the pin to suppress spikes shorter than 50 ns on the input signal, and the

pin is driven by an open drain driver with slew-rate limitation. When this pin is used by

the Two-wire Serial Interface, the pull-up can still be controlled by the PORTC1 bit.

• SCL – Port C, Bit 0

SCL, Two-wire Serial Interface Clock: When the TWEN bit in TWCR is set (one) to

enable the Two-wire Serial Interface, pin PC0 is disconnected from the port and

becomes the Serial Clock I/O pin for the Two-wire Serial Interface. In this mode, there is

a spike filter on the pin to suppress spikes shorter than 50 ns on the input signal, and the

pin is driven by an open drain driver with slew-rate limitation. When this pin is used by

the Two-wire Serial Interface, the pull-up can still be controlled by the PORTC0 bit.

Table 30 and Table 31 relate the alternate functions of Port C to the overriding signals

shown in Figure 26 on page 57.

Table 30. Overriding Signals for Alternate Functions in PC7..PC6

Signal Name

PC7/TOSC2

PC6/TOSC1

PUOE

AS2

PUOV

DDOE

AS2

DDOV

PVOE

PVOV

DIEOE

AS2

DIEOV

–

AIO

T/C2 OSC OUTPUT

T/C2 OSC INPUT

ATMEGA8535L Datasheet(PDF) 63 Page - ATMEL Corporation

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