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Key Reading Circuit Saves I/O Pins: 02/06/03 EDN-Design Ideas / (added
9/03) Some microcontroller applications usually use too many I/O pins to read keys or
onboard switches; in many cases, few pins remain available for other uses. Some
alternative ways to read keys yield more free pins. First, consider some ways to
effect key reading. Table 1 presents a comparison of four methods with references to
circuit configurations (figures 1, 2, 3, and 4)
Keys to Longer Life for CMOS: AN-349 Analog Devices Application Notes
(app note added 2/06) Here's How CMOS Can be Protected Against Abuse
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