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ATmega168-15AZ Datasheet(PDF) 6 Page - ATMEL Corporation |
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ATmega168-15AZ Datasheet(HTML) 6 Page - ATMEL Corporation |
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6 / 340 page  6 7530H–AVR–02/09 ATmega48/88/168 Automotive Depending on the clock selection fuse settings, PB7 can be used as output from the inverting Oscillator amplifier. If the Internal Calibrated RC Oscillator is used as chip clock source, PB7..6 is used as TOSC2..1 input for the Asynchronous Timer/Counter2 if the AS2 bit in ASSR is set. The various special features of Port B are elaborated in “Alternate Functions of Port B” on page 70 and “System Clock and Clock Options” on page 24. 2.4.4 Port C (PC5..0) Port C is a 7-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The PC5..0 output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port C pins that are externally pulled low will source current if the pull-up resistors are activated. The Port C pins are tri-stated when a reset condition becomes active, even if the clock is not running. 2.4.5 PC6/RESET If the RSTDISBL Fuse is programmed, PC6 is used as an I/O pin. Note that the electrical char- acteristics of PC6 differ from those of the other pins of Port C. If the RSTDISBL Fuse is unprogrammed, PC6 is used as a Reset input. A low level on this pin for longer than the minimum pulse length will generate a Reset, even if the clock is not running. The minimum pulse length is given in Table 8-1 on page 43. Shorter pulses are not guaranteed to generate a Reset. The various special features of Port C are elaborated in “Alternate Functions of Port C” on page 74. 2.4.6 Port D (PD7..0) Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port D output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port D pins that are externally pulled low will source current if the pull-up resistors are activated. The Port D pins are tri-stated when a reset condition becomes active, even if the clock is not running. The various special features of Port D are elaborated in “Alternate Functions of Port D” on page 77. 2.4.7 AV CC AV CC is the supply voltage pin for the A/D Converter, PC3..0, and ADC7..6. It should be exter- nally connected to V CC, even if the ADC is not used. If the ADC is used, it should be connected to V CC through a low-pass filter. Note that PC6..4 use digital supply voltage, VCC. 2.4.8 AREF AREF is the analog reference pin for the A/D Converter. 2.4.9 ADC7..6 (TQFP and QFN Package Only) In the TQFP and QFN package, ADC7..6 serve as analog inputs to the A/D converter. These pins are powered from the analog supply and serve as 10-bit ADC channels. |
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