ATtiny88 datasheet(62/266 Pages) ATMEL

62 / 266 page

8008C–AVR–03/09

ATtiny48/88

Table 10-2 summarizes the function of the overriding signals. The pin and port indexes from Fig-

ure 10-6 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 10-2.

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 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

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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