This document describes the design defects and errors of Intel 8xC251 series products, as well as the potential for deviation from published specifications. The document also provides supplemental information and hardware description for the 8xC251 series products.
The document provides a detailed hardware description of the 8xC251Tx embedded microcontroller, the newest member of Intel's MCS‑251 family. It outlines differences from the 8xC251Sx, including a higher 24 MHz maximum operating frequency, two serial I/O ports, and the Extended Data Float timing option controlled by UCONFIG1.
It also notes that the 8xC251Tx may contain design defects (errata) not covered by Intel's warranty and that current errata are available on request. For complete functional details, the user is referred to the related 8xC251SA/B/Sx Embedded Microcontroller User’s Manuals.
| Maximum operating frequency | 24 MHz |
|---|---|
| Number of serial I/O ports | 2 |
| Extended Data Float timing control bit | UCONFIG1 bit 3 (EDF#) |
| Secondary supply voltage | VCC2 (secondary supply) |
| Package types | PLCC and DIP |
The 8xC251Tx can operate up to 24 MHz.
It provides two serial I/O ports, one standard and one secondary.
Bit 3 of the UCONFIG1 register (EDF#) controls the feature.
Yes, the device includes a secondary supply pin VCC2.