ARDUINO NANO(MEGA328P) DISCRIPTION
ARDUINO NAO DISCRIPTION
8-bit AVR Microcontrollers
AT introduction
avr mega328p microprocessor is based on risc(reduced instruction set computer architecture) and 131 powerful instruction. Mostly single clock cycle execution. mega328p is have 32x8 general purpose register. Onchip 2 cycle multiplier. Have high endurance non volatile memory segments.32KBytes of In-System Self-Programmable Flash programMemoy. 1kb eep rom.2KBytes Internal SRAM(static ram). we can Write/Erase Cycles: 10,000 Flash/100,000 EEPROM. Data Retention: 20 years at 85°C/100 years at 25°C.Programming Lock for Software Security. we can use the touch display with the arduino. Atmel® QTouch® Library Support.Capacitive Touch Buttons, Sliders and Wheels can be used with arduino atmega328p.Up to 64 sense channels.
1.Peripheral Features-
- there are two 8,8 bit counters . one timer count is 0 to 8 bit.
One 16-bit Timer/Counter with Separate prescaler Compare Mode, and Capture Mode
-
ARCHITECTURE MEGA328P
VCC-Digital supply voltage.
GND - ground.
Port B (PB[7:0]) XTAL1/XTAL2/TOSC1/TOSC2
:Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit)
The Port B output buffers have symmetrical drive characteristics with both high sink and source capability.
port B can be use for input and output. the pins are connected with pull-up resistors.
The Port B pins are tri-stated when a reset condition becomes active, even if the clock is not running.
tri-state means three condition.. first connect with power .. second connection with ground. and third is open (neither ground nor power) Depending on the clock selection fuse settings, PB6 can be used as input to the inverting Oscillator amplifier and input to the internal clock operating circuit..
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, PB[7:6] is used as TOSC[2:1] input
for the Asynchronous Timer/Counter2 if the AS2 bit in ASSR is set.Port C (PC[5:0]:(NORMAL FUNCTIONING ):-
The internal pull-up resistors (selected for each bit). The PC[5:0]
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:(PORT-C,PIN-6 ONLY ONE PIN):
If the RSTDISBL Fuse is programmed, PC6 is used as an I/O pin. Note that the electrical characteristics 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. Shorter pulses are not guaranteed to generate a Reset The various special features of Port C are elaborated in the Alternate Functions of Port C section.Port D (PD[7:0]
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.
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