Read MCU ATMEGA461V Software out from its secured memory can help to recover the losted content from Microcontroller and replicate the ATmega461V original MCU for the same cloning units;
The clock source for Timer/Counter2 is named clkT2S. clkT2S is by default connected to the main system I/O clock clkIO. By setting the AS2 bit in ASSR, Timer/Counter2 is asynchronously clocked from the TOSC1 pin.
This enables use of Timer/Counter2 as a Real Time Counter (RTC). When AS2 is set, pins TOSC1 and TOSC2 are disconnected from Port C. A crystal can then be connected between the TOSC1 and TOSC2 pins to serve as an independent clock source for Timer/Counter2. The Oscillator is optimized for use with a 32.768 kHz crystal. Applying an external clock source to TOSC1 is not recommended.
For Timer/Counter2, the possible prescaled selections are: clkT2S/8, clkT2S/32, clkT2S/64, clkT2S/128, clkT2S/256, and clkT2S/1024. Additionally, clkT2S as well as 0 (stop) may be selected after IC ATmega48 heximal extraction.
Setting the PSRASY bit in GTCCR resets the prescaler. This allows the user to operate with a predictable prescaler. When this bit is one, the Timer/Counter2 prescaler will be reset when MCU ATmega48V program reading.
This bit is normally cleared immediately by hardware. If the bit is written when Timer/Counter2 is operating in asynchronous mode, the bit will remain one until the prescaler has been reset.
The bit will not be cleared by hardware if the TSM bit is set. Refer to the description of the “Bit 7– TSM: Timer/Counter Synchronization Mode” on page 170 for a description of the Timer/Counter Synchronization mode.
The Serial Peripheral Interface (SPI) allows high-speed synchronous data transfer between the ATmega461v and peripheral devices or between several AVR devices. The ATmega640/1280/1281/2560/2561 SPI includes the following features:
- Full-duplex, Three-wire Synchronous Data Transfer
- Master or Slave Operation
- LSB First or MSB First Data Transfer
- Seven Programmable Bit Rates
- End of Transmission Interrupt Flag
- Write Collision Flag Protection
- Wake-up from Idle Mode
- Double Speed (CK/2) Master SPI Mode
USART can also be used in Master SPI mode, see “USART in SPI Mode” on page 231. The Power Reduction SPI bit, PRSPI, in “Power Reduction Register 0 – PRR0” on page 54 on page 50 must be written to zero to enable SPI module.
