ATMEGA640 datasheet(87/436 Pages) MICROCHIP

87 / 436 page

ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

• OC0B – Port G, Bit 5

OC0B, Output Compare match B output: The PG5 pin can serve as an external output for the TImer/Counter0 Out-

put Compare. The pin has to be configured as an output (DDG5 set) to serve this function. The OC0B pin is also

the output pin for the PWM mode timer function.

• TOSC1 – Port G, Bit 4

TOSC2, Timer Oscillator pin 1: When the AS2 bit in ASSR is set (one) to enable asynchronous clocking of

Timer/Counter2, 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 AS2 bit in ASSR is set (one) to enable asynchronous clocking of

Timer/Counter2, pin PG3 is disconnected from the port, and becomes the inverting output of the Oscillator ampli-

fier. 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 13-22 on page 87 and Table 13-23 on page 88 relates the alternate functions of Port G to the overriding sig-

nals shown in Figure 13-5 on page 73.

Table 13-22. Overriding Signals for Alternate Functions in PG5:PG4

Signal Name

—

PG5/OC0B

PG4/TOSC1

PUOE

–

AS2

PUOV

––

–0

DDOE

–

AS2

DDOV

–

PVOE

–

OC0B Enable

PVOV

–

OC0B

PTOE

––

DIEOE

–

AS2

DIEOV

–

EXCLK

––

AIO

–

T/C2 OSC INPUT

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