ATmega16HVB datasheet(65/273 Pages) ATMEL

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8042A–AVR–07/09

ATmega16HVB/32HVB

14.4.1

Alternate Functions of Port C

The Port C pins with alternate functions are shown in Table 14-2.

The alternate pin configuration is as follows:

• INT0/ EXTPROT - Port C, Bit 0

INT0: External Interrupt Source 0. This pin can serve as external interrupt source. INT0 can be

used as an interrupt pin regardless of whether another function is enabled or not.

EXTPROT: External Battery Protection Input. This pin can serve as external battery protection

input to be able to override the FET controller externally.

• INT1 - Port C, Bit1

INT1: External Interrupt Source 1. This pin can serve as external interrupt source. INT1 can be

used as an interrupt pin regardless of whether another function is enabled or not.

• INT2 - Port C, Bit2

INT2: External Interrupt Source 2. This pin can serve as external interrupt source. INT2 can be

used as an interrupt pin regardless of whether another function is enabled or not.

Table 14-1.

Generic Description of Overriding Signals for Alternate Functions

Signal Name

Full Name

Description

PVOE

Port Value

Override Enable

If this signal is set and the Output Driver is enabled, the port

value is controlled by the PVOV signal. If PVOE is cleared, and

the Output Driver is enabled, the port Value is controlled by the

PORTxn Register bit.

PVOV

Port Value

Override Value

If PVOE is set, the port value is set to PVOV, regardless of the

setting of the PORTxn Register bit.

DIEOE

Digital Input

Enable Override

Enable

If this bit is set, the Digital Input Enable is controlled by the

DIEOV signal. If this signal is cleared, the Digital Input Enable

is determined by MCU state (Normal mode, sleep mode).

DIEOV

Digital Input

Enable Override

Value

If DIEOE is set, the Digital Input is enabled/disabled when

DIEOV is set/cleared, regardless of the MCU state (Normal

mode, sleep mode).

Digital Input

This is the Digital Input to alternate functions. In the figure, the

signal is connected to the output of the schmitt trigger but

before the synchronizer. Unless the Digital Input is used as a

clock source, the module with the alternate function will use its

own synchronizer.

Table 14-2.

Port C Pins Alternate Functions

Port Pin

Alternate Function

PC0

INT0/ EXTPROT(External Interrupt 0 or External Battery Protection Input)

PC1

INT1 (External interrupt 1)

PC2

INT1 (External interrupt 2)

PC3

INT3/ SDA (External Interrupt 3 or SM Bus Data line)

PC4

SCL (SM Bus Clock line)

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