AVR240: 4x4 Keypad-Wake Up on Keypress on tinyAVR and megaAVR devices
This Application Note describes a simple interface to a 4 x 4 keypad designed for low-power battery operation, using a minimum of external components. The targeted device spends most of the time in Power-Down, only waking up when a key is pressed. It includes an assembly code written for AT90S1200.
Microchip, AVR, Microcontroller, megaAVR, tinyAVR, sleep mode, LED, Keypad, Low Power, Battery, AT90S1200