Full support for special function registers and interrupt routines written directly in C.
void timer0_isr(void) interrupt 1 using 2 // Use register bank 2 TF0 = 0; // Clear interrupt flag // ... do work
This was far more efficient than using a full byte for flags.
Features advanced code analysis to detect unused variables and share memory storage for variables not used simultaneously, which is critical for the 8051's limited RAM. Modern Availability and Support
The compiler simplified writing Interrupt Service Routines (ISRs) with a simple interrupt keyword:
This compiler has been discontinued and is no longer supported. This compiler has been replaced by the MPLAB® XC8 PRO (SW006021-2) Microchip Technology Which C compiler do you prefer for CP/M?
During the peak of 8-bit development, HI-TECH Software was renowned for its optimization techniques, such as . In the late 2000s, Microchip Technology (url: https://www.microchip.com) acquired HI-TECH Software to bolster its own compiler offerings. While Microchip transitioned much of this technology into the MPLAB XC8 compiler (url: microchip.com) for PIC microcontrollers, the legacy HI-TECH C51 toolchain remains a point of interest for developers maintaining older 8051-based hardware. Core Features of HI-TECH C51
The 8051 has four register banks (R0-R7) in IRAM. Hi-Tech C51 allowed developers to select which bank was used for interrupts versus background code, preventing stack overflows.
While difficult to find in official archives today, a fully functioning copy of HI-TECH C for 8051 XA recently surfaced on Matt Millman's Tech Blog . You can also find legacy downloads of the HI-TECH C51-lite edition on platforms like Software Informer . If you'd like, I can:
The Hi-Tech C51 has a wide range of potential applications across various industries and aspects of our lives. Some of the most significant uses of this device include:
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