Datasheet

POWER SUPPLY CIRCUIT:
The power supply of AVR-MT128 is taken from Power jack connector. You
should apply 9 VAC or +12 VDC at the positive central pin.
The consumption of the board is about 30 mA.
RESET CIRCUIT:
AVR-MT128 reset circuit is made with ZM33064 with typical threshold
4.5V. When the voltage falls bellow that minimum, the MSU resets.
CLOCK CIRCUIT:
Quartz crystal 16MHz for maximum performance is connected to
ATMega128 pin 23 (XTAL2) and pin 24 (XTAL1).
Additional 32 768 Hz tact generator is connected to ATMega128 pin 18
(TOSC2/PG3) and pin 19 (TOSC1/PG4) and supplies the Real Time Clock.
JUMPER DESCRIPTION:
J
This jumper supplies the input user frequency FREQ to either
pin 31 (T1/PD6) or pin 32 (T2/PD7). When 1-2 is shorted the input
frequency pin is connected to T2. When 2-3 is shorted the input frequency pin is
connected to T1.
Default state is 1-2 shorted.
INPUT/OUTPUT:
Status LED (red) connected to the relay.
Relay with name REL connected to ATMega128 pin 45 (PA6/AD6).
Trimmer LED_TR connected to the LCD.
Liquid crystal display.
Buzzer with name BUZZ connected to ATMega128 pin 6 (OC3B/INT4/PE4)
and pin 7 (OC3C/INT5/PE5).
User button B1 connected to ATMega128 pin 51 (PA0/AD0).
User button B2 connected to ATMega128 pin 50 (PA1/AD1).
User button B3 connected to ATMega128 pin 49 (PA2/AD2).
User button B4 connected to ATMega128 pin 48 (PA3/AD3).
User button B5 connected to ATMega128 pin 47 (PA4/AD4).