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AT90CAN128-15MT Datasheet(PDF) 8 Page - ATMEL Corporation |
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AT90CAN128-15MT Datasheet(HTML) 8 Page - ATMEL Corporation |
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8 / 431 page  8 7682C–AUTO–04/08 AT90CAN32/64/128 Port F also serves as an 8-bit bi-directional I/O port, if the A/D Converter is not used. Port pins can provide internal pull-up resistors (selected for each bit). The Port F output buffers have sym- metrical drive characteristics with both high sink and source capability. As inputs, Port F pins that are externally pulled low will source current if the pull-up resistors are activated. The Port F pins are tri-stated when a reset condition becomes active, even if the clock is not running. Port F also serves the functions of the JTAG interface. If the JTAG interface is enabled, the pull- up resistors on pins PF7(TDI), PF5(TMS), and PF4(TCK) will be activated even if a reset occurs. 1.7.9 Port G (PG4..PG0) Port G is a 5-bit I/O port with internal pull-up resistors (selected for each bit). The Port G output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port G pins that are externally pulled low will source current if the pull-up resistors are activated. The Port G pins are tri-stated when a reset condition becomes active, even if the clock is not running. Port G also serves the functions of various special features of the AT90CAN32/64/128 as listed on page 88. 1.7.10 RESET Reset input. A low level on this pin for longer than the minimum pulse length will generate a reset. The minimum pulse length is given in characteristics. Shorter pulses are not guaranteed to generate a reset. The I/O ports of the AVR are immediately reset to their initial state even if the clock is not running. The clock is needed to reset the rest of the AT90CAN32/64/128. 1.7.11 XTAL1 Input to the inverting Oscillator amplifier and input to the internal clock operating circuit. 1.7.12 XTAL2 Output from the inverting Oscillator amplifier. 1.7.13 AVCC AVCC is the supply voltage pin for the A/D Converter on Port F. It should be externally con- nected to VCC, even if the ADC is not used. If the ADC is used, it should be connected to VCC through a low-pass filter. 1.7.14 AREF This is the analog reference pin for the A/D Converter. 2. About Code Examples This documentation contains simple code examples that briefly show how to use various parts of the device. These code examples assume that the part specific header file is included before compilation. Be aware that not all C compiler vendors include bit definitions in the header files and interrupt handling in C is compiler dependent. Please confirm with the C compiler documen- tation for more details. |
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