ATtiny 13a

The Atmel picoPower 8-bit AVR RISC-based microcontroller featuring 1KB of ISP Flash, 64-byte EEPROM, 64-byte SRAM, 32-Byte register file, and 4-channel 10-bit A/D converter. The device achieves up to 20 MIPS throughput at 20 MHz at 1.8-5.5 V operation.
By executing powerful instructions in a single clock cycle, the ATtiny13A achieves throughputs approaching 1 MIPS per MHz allowing you to optimize power consumption versus processing speed.
Key Parameters                              ParameterValue
Flash (kBytes):                                     1 kBytes
Pin Count:                                             8
Max. Operating Freq. (MHz):           20 MHz
CPU:                                                       8-bit AVR
Hardware QTouch Acquisition:        No
Max I/O Pins:                                        6
Ext Interrupts:                                      6
USB Speed:                                            No
USB Interface:                                      No