This document is the manual of DS2250(T) soft microcontroller module
The DS2250(T) is a fully 8051‑compatible 8‑bit CMOS soft microcontroller module that uses non‑volatile SRAM for program and data storage (8, 32 or 64 kB). It offers on‑chip full‑duplex serial I/O, two timer/event counters, 32 parallel I/O lines, and an optional permanently powered real‑time clock.
The document provides pin descriptions, instruction set compatibility, memory map, serial and parallel program loading methods, electrical characteristics, absolute maximum ratings, and package dimensions. It also lists ordering information for the various RAM‑size and clock‑speed options.
| Non‑volatile RAM size options | 8 kB, 32 kB, 64 kB |
|---|---|
| Number of parallel I/O lines | 32 |
| Supply voltage (VCC) range | 4.05 V min – 4.65 V max |
| Operating temperature range | 0 °C to +70 °C |
| Absolute maximum pin voltage | -0.3 V to +7.0 V relative to ground |
Pin P3.0 (RXD) is a general‑purpose I/O pin that also serves as the receive signal for the on‑board UART.
The device can tolerate pin voltages from –0.3 V to +7.0 V, operating temperatures from 0 °C to +70 °C, and storage temperatures from –40 °C to +70 °C.