80C39 is a CMOS Version of 8048 the one that preceded
8031-8051. MCS48 is the set for that. Here are some example
projects for 80C39-8748-8749 microcontroller. MCS51 is the set
for 80C31 and 8051.
to Frequency Converter AD Interface is the analog front
end of this instrument. Uses a LM331 VCO. The Signal
conditioning too is integrated in this circuit.
A complete two set point Process Controller using 80C39. 8048
and its mnemonic code set MCS-48, is
the first popular Microcontroller. This had no Serial Port and limited memory. This code was written by me, and it works ok. Even though these chips are obsolete, the interfacing circuit and code can help learn some concepts.
80C39 and MCS48 based Process Controller is the main circuit that has the LED 7 segment display for output and push keys for input. The old form of Human Machine Interface - HMI.
This was supposed to have Analog in and Analog out. Some parts of the circuit may be in the 80C51 page. This has ramp-up and ramp-down settings for the Increment and Decrement buttons. This helps setting setpoint quickly. There is also debouncing for the pushbutton.
The MCS-48 microcontroller (µC) series, Intel's first
microcontroller, was originally released in 1976. Its first
members were 8048, 8035 and 8748. Initially this family was
produced using NMOS-technology, in the early 1980s it became
available in CMOS-technology.
to Analog Converter with uC Watchdog is the front end
and an external hardware watchdog of an early kind.
These are simple but robust circuits and worked well in noisy
The Intel 8748 has on-chip clock oscillator, 2× 8-bit timers,
27× I/O ports, 64 bytes of RAM and 1 KB of EPROM. A version
with 2 KB EPROM and 128 bytes RAM was also available under the
Learn more about current 8031 tools here - Rigel
- Ebedded Controllers and Software
20th Apr 2020
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