The Attiny family continues to grow:
“The new ATtiny441 and ATtiny841 MCUs feature a very small 3x3 QFN package and 4 and 8KB of Flash memory, respectively. The new devices offer enhanced analog performance, including an ADC with calibrated multilevel internal analog reference, with 12 ADC channels on a 14-pin device, two independent USARTs with wake-up from power down without data loss, SPI interface and an I2C slave interface for enhanced communication capabilities. These devices also feature flexible clocking options, including a ± 2% internal oscillator with fast wake-up, allowing the UARTs to communicate without the need of an external crystal, and to wake-up from sleep without data loss.”