Gecko's CPU Library

NEC V40 processors

Introduction: 1984 (?)

NEC V40 is a 16-bit embedded microprocessor with 8-bit external data bus. The processor is compatible with NEC V20 CPU, and includes all of the V20's features: 8080 emulation, new instructions, low-power consumption, standby mode, and others. In addition to that it integrates many peripherals on the chip - clock generator, timers/counters, bus interface and bus arbitration units, asynchronous serial I/O channel, wait-state generator, DRAM refresh control and 8-input interrupt control unit. Although the V40 has the same new instructions that are present in Intel 80188 microprocessor, and has similar set of integrated peripherals, it is not pin-compatible with the 80188 processor.