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.
8051 Architecture Microcontrollers
Atmel's 8-bit microcontrollers (MCUs) based on the 8051 instruction set, combine proven technology with the latest features and functionality, with all featuring advanced flash memory.
Device Family
Single Cycle Core Flash ISP (In-System Programmable) Flash (Reprogrammable) CAN Networking MCUs USB MCUs ROMless