| 摘要 |
<p>The circuit includes resisters (R21-R24) pulling up the scan signal from a CPU, a decoder (DEC) decoding the scan data to decimal code, a displaying unit (100) driving the light emission diode utilizing a special key processing signal inverted by AND gates (NA21-NA23), a key matrix unit (200) composed to scan the row utilizing a decoded signal, and to check the column through resisters (R28-R43), and an oscillator (300) including an I/O expanded circuit (EXP) inputting the scan data and transmitting the sensing data with bit unit, and oscillator (X-TAL) providing the clock signal to the CPU.</p> |
