ATMEGA48-15AZV Просмотр технического описания (PDF) - Atmel Corporation
Номер в каталоге
Компоненты Описание
производитель
ATMEGA48-15AZV Datasheet PDF : 340 Pages
| |||
2.4.4
2.4.5
2.4.6
2.4.7
2.4.8
2.4.9
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.
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.
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.
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.
AVCC
AREF
AVCC is the supply voltage pin for the A/D Converter, PC3..0, and ADC7..6. It should be exter-
nally connected 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. Note that PC6..4 use digital supply voltage, VCC.
AREF is the analog reference pin for the A/D Converter.
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.
6 Atmel ATmega48/88/168 Automotive
7530J–AVR–03/12
Share Link: 