I have a problem, lack of flash memory. I can not use "Mega" the 2560, my project has to be DIP socket.
The processor ATMEGA644 is compatible? What needs to change to be compatible?
DIP Easy to assemble, we can use sockets. 40-pin PDIP, 44-lead TQFP, and 44-pad QFN/MLF 32 Programmable I/O Lines 64K Bytes of In-System Self-programmable Flash program memory.
Features • High-performance, Low-power AVR® 8-bit Microcontroller • Advanced RISC Architecture – 131 Powerful Instructions – Most Single-clock Cycle Execution – 32 x 8 General Purpose Working Registers – Fully Static Operation – Up to 20 MIPS Throughput at 20 MHz • High Endurance Non-volatile Memory segments – 64K Bytes of In-System Self-programmable Flash program memory – 2K Bytes EEPROM – 4K Bytes Internal SRAM – Write/Erase cyles: 10,000 Flash/100,000 EEPROM(1)(3) – Data retention: 20 years at 85°C/100 years at 25°C(2)(3) – Optional Boot Code Section with Independent Lock Bits In-System Programming by On-chip Boot Program True Read-While-Write Operation – Programming Lock for Software Security • JTAG (IEEE std. 1149.1 Compliant) Interface – Boundary-scan Capabilities According to the JTAG Standard – Extensive On-chip Debug Support – Programming of Flash, EEPROM, Fuses, and Lock Bits through the JTAG Interface • Peripheral Features – Two 8-bit Timer/Counters with Separate Prescalers and Compare Modes – One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture Mode – Real Time Counter with Separate Oscillator – Six PWM Channels – 8-channel, 10-bit ADC Differential mode with selectable gain at 1x, 10x or 200x – Byte-oriented Two-wire Serial Interface – One Programmable Serial USART – Master/Slave SPI Serial Interface – Programmable Watchdog Timer with Separate On-chip Oscillator – On-chip Analog Comparator – Interrupt and Wake-up on Pin Change • Special Microcontroller Features – Power-on Reset and Programmable Brown-out Detection – Internal Calibrated RC Oscillator – External and Internal Interrupt Sources – Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby and Extended Standby • I/O and Packages – 32 Programmable I/O Lines – 40-pin PDIP, 44-lead TQFP, and 44-pad QFN/MLF • Speed Grades – ATmega644V: 0 - 4MHz @ 1.8 - 5.5V, 0 - 10MHz @ 2.7 - 5.5V – ATmega644: 0 - 10MHz @ 2.7 - 5.5V, 0 - 20MHz @ 4.5 - 5.5V • Power Consumption at 1 MHz, 3V, 25°C – Active: 240 ?A @ 1.8V, 1MHz – Power-down Mode: 0.1 ?A @ 1.8V