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ATMEGA128A Scheda tecnica(PDF) 85 Page - ATMEL Corporation

Il numero della parte ATMEGA128A
Spiegazioni elettronici  Write/Erase cycles: 10,000 Flash/100,000 EEPROM
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Produttore elettronici  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA128A Scheda tecnica(HTML) 85 Page - ATMEL Corporation

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8151G–AVR–07/10
ATmega128A
12.3.7
Alternate Functions of Port G
In 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:
• TOSC1 – Port G, Bit 4
TOSC1, Timer Oscillator pin 1: When 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: When 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
WR is the external data memory write control strobe.
Table 12-20. Port G Pins Alternate Functions
Port Pin
Alternate Function
PG4
TOSC1 (RTC Oscillator Timer/Counter0)
PG3
TOSC2 (RTC Oscillator Timer/Counter0)
PG2
ALE (Address Latch Enable to external memory)
PG1
RD (Read strobe to external memory)
PG0
WR (Write strobe to external memory)


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