Rainbow-electronics ATmega163L Manual do Utilizador descarregar pdf (Página 107)

ATmega163(L)

107

n: 7…0, pin number

Alternate Functions of PORTC

•

TOSC2 - PORTC, Bit 7

TOSC2, Timer Oscillator pin 2: When the AS2 bit in ASSR is set (one) to enable asynchronous 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 - PORTC, Bit 6

TOSC1, Timer Oscillator pin 1: When the AS2 bit in ASSR is set (one) to enable asynchronous clocking of Timer/Counter1,

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 - PORTC, Bit 1

SDA, 2-wire Serial Bus Data: When the TWEN bit in TWCR is set (one) to enable the 2-wire Serial Interface, pin PC1 is dis-

connected from the port and becomes the Serial Data I/O pin for the 2-wire Serial Interface. In this mode, there is a spike

filter on the pin to capture spikes shorter than 50 ns on the input signal, and the pin is driven by an open collector driver with

slew rate limitation.

•

SCL - PORTC, Bit 0

SCL, 2-wire Serial Interface Clock: When the TWEN bit in TWCR is set (one) to enable the 2-wire Serial Interface, pin PC1

is disconnected from the port and becomes the Serial Clock I/O pin for the 2-wire Serial Interface. In this mode, there is a

spike filter on the pin to capture spikes shorter than 50 ns on the input signal.

Port C Schematics

Note that all port pins are synchronized. The synchronization latches are not shown in the figure.

Table 47. DDCn Effects on PORT C Pins

DDCn PORTCn PUD I/O Pull Up Comment

0 0 x Input No Tri-state (Hi-Z)

0 1 1 Input No Tri-state (Hi-Z)

0 1 0 Input Yes PCn will source current if ext. pulled low.

1 0 x Output No Push-pull Zero Output

1 1 x Output No Push-pull One Output

1 2 ... 102 103 104 105 106 107 108 109 110 111 112 ... 155 156

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