NEC V25

The NEC V25 (μPD70320) is the microcontroller version of the NEC V20 processor, manufactured by NEC Corporation. Features include:

• NEC V20 core: 8-bit external data path, 20-bit address bus, machine code compatible with the Intel 8088 (the processor used in the original IBM PC)
• On-chip peripheral hardware mapped in memory address space
• Two-channel 16-bit timers
• Internal interrupt controller
• Dual-channel UART and baud rate generator for serial communications

NEC V25 in a PLCC package

^[1]

• Eight register banks,

^[2] base address of which can be dynamically relocated with Internal Data area Base (IDB) Register. ^[3]

• A two-channel DMA controller, enabling the direct addressing of the entire 1MB memory address space.^[4]

It was officially phased out by NEC in early 2003.^[5]