ATmega16 datasheet(62/357 Pages) ATMEL

62 / 357 page

2466S–AVR–05/09

ATmega16(L)

• 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 sup-

press 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 sup-

press 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 29 and Table 30 relate the alternate functions of Port C to the overriding signals shown in

Figure 26 on page 55.

Table 29. Overriding Signals for Alternate Functions in PC7..PC4

Signal

Name

PC7/TOSC2

PC6/TOSC1

PC5/TDI

PC4/TDO

PUOE

AS2

JTAGEN

PUOV

DDOE

AS2

JTAGEN

DDOV

SHIFT_IR + SHIFT_DR

PVOE

JTAGEN

PVOV

TDO

DIEOE

AS2

JTAGEN

DIEOV

–

AIO

T/C2 OSC OUTPUT

T/C2 OSC INPUT

TDI

–

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