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ATMEGA128A Scheda tecnica(PDF) 85 Page - ATMEL Corporation |
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ATMEGA128A Scheda tecnica(HTML) 85 Page - ATMEL Corporation |
85 / 386 page 85 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) |
Codice articolo simile - ATMEGA128A_1 |
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Descrizione simile - ATMEGA128A_1 |
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