AT89S4051-24PU, Микроконтроллер 8-Бит, 8051, 24МГц, 4КБ Flash [DIP-20]

8051 Architecture Flash ISP (In-System Programmable) Microcontrollers, Atmel
Atmel offers Flash 8051 microcontrollers featuring In-System Programming (ISP) that they can be programmed with the appropriate software, either in parallel or in serial mode.