| 摘要 |
A keypad scanner mechanism which may be incorporated with an integrated circuit including a microcontroller. The keypad scanner mechanism includes a keypad with more than one key. The keypad scanner mechanism has an activity detect mode and a normal mode. In the activity detect mode, the keypad scanner mechanism wakes up the integrated circuit and triggers the normal mode. In the normal mode, the keypad scanner mechanism identifies and reports to the microcontroller the depression of keys on the keypad. The keypad scanner mechanism also includes a means for debouncing, a multiple keys down code, and a no keys down code. The keypad scanner mechanism is suitable for any keypad application, however, it has been found that the keypad scanner mechanism is especially suitable for incorporation into the base and handset units of a cordless telephone that integrates the speech, control channels, and microcontroller portions of a modem, and the man-machine interface functions of a cordless telephone.
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