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ATmega128
Alternate Functions of
Port G
In Atmel ? AVR ? ATmega103 compatibility mode, only the alternate functions are the defaults for
Port G, and Port G cannot be used as General Digital Port Pins. The alternate pin configuration
is as follows:
Table 45. Port G Pins Alternate Functions
Port Pin
PG4
PG3
PG2
PG1
PG0
Alternate Function
TOSC1 (RTC Oscillator Timer/Counter0)
TOSC2 (RTC Oscillator Timer/Counter0)
ALE (Address Latch Enable to external memory)
RD (Read strobe to external memory)
W R ( W rite strobe to external memory)
? TOSC1 – Port G, Bit 4
TOSC1, Timer Oscillator pin 1: W hen the AS0 bit in ASSR is set (one) to enable asynchronous
clocking of Timer/Counter0, pin PG4 is disconnected from the port, and becomes the input of the
inverting Oscillator amplifier. In this mode, a Crystal Oscillator is connected to this pin, and the
pin can not be used as an I/O pin.
? TOSC2 – Port G, Bit 3
TOSC2, Timer Oscillator pin 2: W hen the AS0 bit in ASSR is set (one) to enable asynchronous
clocking of Timer/Counter0, pin PG3 is disconnected from the port, and becomes the inverting
output of the Oscillator amplifier. In this mode, a Crystal Oscillator is connected to this pin, and
the pin can not be used as an I/O pin.
? ALE – Port G, Bit 2
ALE is the external data memory Address Latch Enable signal.
? RD – Port G, Bit 1
RD is the external data memory read control strobe.
? WR – Port G, Bit 0
W R is the external data memory write control strobe.
Table 46 and Table 47 relates the alternate functions of Port G to the overriding signals shown in
Figure 33 on page 70 .
Table 46. Overriding Signals for Alternate Functions in PG4..PG1
Signal Name
PUOE
PUOV
DDOE
DDOV
PVOE
PVOV
DIEOE
DIEOV
DI
AIO
PG4/TOSC1
AS0
0
AS0
0
0
0
AS0
0
–
T/C0 OSC INPUT
PG3/TOSC2
AS0
0
AS0
0
0
0
AS0
0
–
T/C0 OSC OUTPUT
PG2/ALE
SRE
0
SRE
1
SRE
ALE
0
0
–
–
PG1/RD
SRE
0
SRE
1
SRE
RD
0
0
–
–
84
2467X–AVR–06/11
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