ATMEGA640 datasheet(74/436 Pages) MICROCHIP

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

Table 13-2 summarizes the function of the overriding signals. The pin and port indexes from Figure 13-5 on page

73 are not shown in the succeeding tables. The overriding signals are generated internally in the modules having

the alternate function.

The following subsections shortly describe the alternate functions for each port, and relate the overriding signals to

the alternate function. Refer to the alternate function description for further details.

Table 13-2.

Generic Description of Overriding Signals for Alternate Functions

Signal Name

Full Name

Description

PUOE

Pull-up Override

Enable

If this signal is set, the pull-up enable is controlled by the PUOV signal. If

this signal is cleared, the pull-up is enabled when {DDxn, PORTxn, PUD} =

0b010.

PUOV

Pull-up Override Value

If PUOE is set, the pull-up is enabled/disabled when PUOV is set/cleared,

regardless of the setting of the DDxn, PORTxn, and PUD Register bits.

DDOE

Data Direction Override

Enable

If this signal is set, the Output Driver Enable is controlled by the DDOV

signal. If this signal is cleared, the Output driver is enabled by the DDxn

DDOV

Data Direction Override

Value

If DDOE is set, the Output Driver is enabled/disabled when DDOV is

set/cleared, regardless of the setting of the DDxn Register bit.

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.

PTOE

Port Toggle Override

Enable

If PTOE is set, the PORTxn Register bit is inverted.

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.

AIO

Analog Input/Output

This is the Analog Input/output to/from alternate functions. The signal is

connected directly to the pad, and can be used bi-directionally.

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