This document describes a product that is pin and software compatible with standard 80C51 products and 80C51Fx/Rx/Rx+. It can be used as a plug-in replacement for Intel's 8xC251Sx. The product features the C251 core, a 40-byte register file, registers accessible as bytes, words or dwords, a three-stage instruction pipeline, and a 16-bit internal code fetch. It also has an enriched C51 instruction set, a 16-bit and 32-bit ALU, compare and conditional jump instructions, an expanded set of move instructions, linear addressing, and 1KB of on-chip RAM. The external memory space is programmable from 64 kilobytes to 256 kilobytes. The product is available in different versions with on-chip EPROM/OTPROM or masked ROM, and there is also a ROMless version. It provides four 8-bit parallel I/O ports, a full duplex UART with independent baud rate generator, a synchronous serial link controller, TWI multi-master protocol, μWire and SPI master and slave protocols, three 16-bit timers/counters, an event and waveform controller, and compatibility with Intel's programmable counter array (PCA). The product has a common 16-bit timer/counter reference with four possible clock sources and five modules, each with four programmable modes, including software timer/counter and timer/counter functionality.
The TSC80251G2D family are 8/16-bit microcontrollers based on the C251 architecture, pin‑compatible with standard 80C51/Fx/Rx/Rx+ devices. They add a Synchronous Serial Link Controller, UART with independent baud‑rate generator, power‑management features, and multiple timer/counter modules.
Key specifications include up to 256 KB external memory, 1 KB on‑chip RAM, operating voltage from 2.7 V to 5.5 V (low‑voltage version) or 4.5 V to 5.5 V (high‑speed version), and typical current consumption of 35 mA at 24 MHz. The device is offered in PDIP‑40, PLCC‑44 and VQFP‑44 packages and supports commercial (0 °C‑+70 °C) and industrial (‑40 °C‑+85 °C) temperature ranges.
| Operating Voltage (High‑Speed) | 4.5 V to 5.5 V |
|---|---|
| Operating Voltage (Low‑Voltage) | 2.7 V to 5.5 V |
| Typical Operating Current | 35 mA at 24 MHz |
| Typical Power‑down Current | 2 µA |
| On‑Chip RAM | 1 KB |
| Package Types | PDIP‑40, PLCC‑44, VQFP‑44 |
| Temperature Range (Commercial) | 0 °C to +70 °C |
| Temperature Range (Industrial) | -40 °C to +85 °C |
| Extended Temperature Option | -55 °C to +125 °C |
It includes 1 KB of on‑chip RAM.
It is offered in PDIP‑40, PLCC‑44, and VQFP‑44 packages.