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The Atmel 8-bit AVR RISC-based microcontroller combines 32 KB ISP flash memory with read-while-write capabilities, 1 KB EEPROM, 2 KB SRAM, 23 general purpose I/O lines, 32 general purpose working registers, three flexible timer/counters with compare modes, internal and external interrupts, serial programmable USART, a byte-oriented 2-wire serial interface, SPI serial port, 6-channel 10-bit A/D converter (8-channels in TQFP and QFN/MLF packages), programmable watchdog timer with internal oscillator, and five software selectable power saving modes. The device operates between 1.8-5.5 volts. The device achieves throughputs approaching 1 MIPS. Parameter: Value Flash (kBytes):32 kBytes Pin Count:28 Max. Operating Freq. (MHz):20 MHz CPU:8-bit AVR # of Touch Channels:16 Hardware QTouch Acquisition:No Max I/O Pins:23 Ext Interrupts:24 USB Speed:NoUSB Interface:No