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ATmega128
Table 26 summarizes the function of the overriding signals. The pin and port indexes from Fig-
ure 33 are not shown in the succeeding tables. The overriding signals are generated internally in
the modules having the alternate function.
Table 26. Generic Description of Overriding Signals for Alternate Functions.
Signal
Name
PUOE
PUOV
DDOE
DDOV
PVOE
PVOV
DIEOE
DIEOV
DI
AIO
Full Name
Pull-up
Override Enable
Pull-up
Override Value
Data Direction
Override Enable
Data Direction
Override Value
Port Value
Override Enable
Port Value
Override Value
Digital Input
Enable Override
Enable
Digital Input
Enable Override
Value
Digital Input
Analog
Input/output
Description
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.
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.
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.
If DDOE is set, the Output Driver is enabled/disabled
when DDOV is set/cleared, regardless of the setting of the
DDxn Register bit.
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.
If PVOE is set, the port value is set to PVOV, regardless of
the setting of the PORTxn Register bit.
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).
If DIEOE is set, the Digital Input is enabled/disabled when
DIEOV is set/cleared, regardless of the MCU state
(Normal mode, Sleep modes).
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.
This is the Analog Input/output to/from alternate functions.
The signal is connected directly to the pad, and can be
used bi-directionally.
The following subsections shortly describes the alternate functions for each port, and relates the
overriding signals to the alternate function. Refer to the alternate function description for further
details.
71
2467X–AVR–06/11
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