Single-cycle microcontroller with 32KB ISP flash and 12-clock compatibility mode. It includes 1408 bytes RAM, 2KB ROM with UART-base Bootloader, PWM, UART, TWI, SPI, PCA, up to 42 I/Os, 10-bit A/D, dual Analog Comparators, an internal 8MHz RC oscillator, and on-chip debug. The TWI and On-Chip Debug features are not available on 40-pin PDIP package.