The µPD70320 (V25) is a single-chip microcontroller on which 16-bit CPU, RAM, serial interface, timer, DMA controller, interrupt controller, etc. are all integrated. The µPD70320 is compatible with the 8/16-bit microprocessor µPD70108/70116 (V20TM/V30TM) on the software level.

FEATURES
• Internal 16-bit architecture and external 8-bit data bus
• Compatible with µPD70108/70116 (in native mode) on software level (some instructions added)
• Minimum instruction cycle : 400 ns/5 MHz (µPD70320) 250 ns/8 MHz (µPD70320-8)
• On-chip RAM : 256 words × 8 bits
• Input port (port T) with comparator : 8 bits
• I/O lines (input port : 4 bits, input/output port : 20 bits)
• Serial interface (internal dedicated baud rate generator) : 2 channels Asynchronous mode and I/O interface mode
• Interrupt controller
    • Programmable priority (8 levels)
    • Vectored interrupt function
    • Register bank switching function
    • Macro service function
• DRAM and pseudo SRAM refreshing functions
• DMA controller : 2 channels
• 16-bit timer : 2 channels
• Time base counter
• On-chip clock generator
• Programmable wait function
• Standby function (STOP/HALT)