ATmega16 datasheet(56/357 Pages) ATMEL

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2466S–AVR–05/09

ATmega16(L)

Table 21 summarizes the function of the overriding signals. The pin and port indexes from Fig-

ure 26 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 21. 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 Register bit.

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.

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 modes).

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 modes).

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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