AT90CAN128-16AE ATMEL Corporation, AT90CAN128-16AE Datasheet - Page 84

• Manufacturer Part Number: AT90CAN128-16AE
• Description: 8-bit Avr Microcontroller With 128K Bytes of Isp Flash And CAN Controller.flash (Kbytes) 128 Vcc (V) 2.7-5.5 EEPROM (Kbytes) 4 SRAM (bytes) 4K CAN (mess. Obj.) 15
• Manufacturer: ATMEL Corporation

Alternate Functions of Port G
84
AT90CAN128
The alternate pin configuration is as follows:
Table 47. Port G Pins Alternate Functions
The alternate pin configuration is as follows:
• TOSC1 – Port G, Bit 4
TOSC2, Timer/Counter2 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/Counter2 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 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.
Port Pin
PG4
PG3
PG2
PG1
PG0
Alternate Function
TOSC1 (RTC Oscillator Timer/Counter2)
TOSC2 (RTC Oscillator Timer/Counter2)
ALE (Address Latch Enable to external memory)
RD (Read strobe to external memory)
WR (Write strobe to external memory)
4250C–CAN–03/04