NEC V25 in a PLCC package

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[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]

References

  1. ↑ "User's Manual – V25, V35 – 16/8-, 16-bit Single-chip microcontrollers – Hardware" (PDF). NEC Corporation. 1998. p. 221.
  2. ↑ "User's Manual V25TM V35TM 16/8-, 16-BIT SINGLE-CHIP MICROCONTROLLERS HARDWARE". p. 62. Retrieved 2023-11-03.
  3. ↑ "User's Manual V25TM V35TM 16/8-, 16-BIT SINGLE-CHIP MICROCONTROLLERS HARDWARE". p. 77. Retrieved 2023-12-18.
  4. ↑ "User's Manual V25TM V35TM 16/8-, 16-BIT SINGLE-CHIP MICROCONTROLLERS HARDWARE". p. 173. Retrieved 2023-11-27.
  5. ↑ "NEC V25 EOL" (PDF). Tern inc. Archived from the original (PDF) on Sep 13, 2006.
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