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125 results found, displaying items 121 - 125
Use a tiny microcontroller with a large keypad
Like a student needing just one more night to prepare for a coming exam, a microcontroller designer often wishes for just one more I/O line as a project approaches its final stages. Even for the relatively capable 8X752 microcontroller at 28 pins,...
Build a simple finite state machine
Probably everyone has seen in some textbook the block diagram of a “finite state machine” (FSM), and most likely nobody used it in practice (Fig. 1). For the few who aren’t familiar with it, an FSM is a...
Add an RS-232 output to any PIC microprocessor
Some PIC microprocessors have a built-in serial interface module while others do not. The latter group includes the 16C54, ’55, ’56, ’70, ’71, ’72, and others. Adding a serial output to these processors takes but a few lines of code (...
Tiny smart card OS for PIC16C84
ISO7816-compliant “asynchronous” smart cards consist primarily of nonvolatile memory (ROM, EPROM, and/or EEPROM), managed by an embedded 8-bit microcontroller. Usually, this microcontroller derives from a very popular processor family such as the...
Single-supply microprocessor supervisor monitors bipolar rails
The circuit shown monitors both rails of a bipolar power supply with respect to user-defined threshold voltages (see the figure). It will produce a reset signal when either rail passes the associated reset...
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