公开(公告)号：US06424274B1

公开(公告)日：2002-07-23

申请号：US09290139

申请日：1999-04-13

申请人： Paul G. Schnizlein ,  Kenneth Tallo

发明人： Paul G. Schnizlein ,  Kenneth Tallo

IPC分类号： H03K1794

CPC分类号： H03M11/24

摘要： The invention is, in its various aspects, an apparatus and a method for scanning a keypad or a keyboard. The apparatus comprises a keypad and an integrated circuit. The keypad includes a plurality of chained resistors and a plurality of key switches. Each of the plurality of key switches is tied to a common node at a first terminal thereof and tapping the chained resistors at a second node thereof. Each of the key switches generates a signal indicative of the respective key switch being pressed when the key switch is pressed. The integrated circuit is capable of receiving the generated signal. The integrated circuit furthermore includes an analog to digital converter capable of generating a reference signal and a circuit capable of determining which key switch has been pressed from the magnitude of the generated voltage signal and the reference signal. The method for scanning a keypad comprises generating a voltage signal whose magnitude indicates which key is being pressed, and determining from the magnitude of the generated voltage signal which key was pressed.

摘要翻译： 本发明在其各个方面是用于扫描小键盘或键盘的装置和方法。 该装置包括键盘和集成电路。 键盘包括多个链式电阻器和多个键开关。 多个键开关中的每一个在其第一端处被连接到公共节点，并在其第二节点敲击链接的电阻器。 当按键开关被按下时，每个按键开关产生指示按压各个按键开关的信号。 集成电路能够接收所产生的信号。 集成电路还包括能够产生参考信号的模/数转换器和能够根据产生的电压信号和参考信号的大小来确定哪个键开关被按下的电路。 用于扫描键盘的方法包括产生一个电压信号，该电压信号的幅度指示正在按下哪个键，并根据产生的电压信号的大小来确定哪一个键被按下。

公开(公告)号：US06412055B1

公开(公告)日：2002-06-25

申请号：US09106880

申请日：1998-06-30

申请人： Kenneth Tallo ,  Kenneth D. Alton

发明人： Kenneth Tallo ,  Kenneth D. Alton

IPC分类号： G06F1200

摘要： A method and apparatus for allowing developers to develop software for their product. The method includes providing a first mode signal to a processor to operate in a development mode. The method also includes executing instructions stored in a first region of the memory in response to the first mode signal, providing data to the processor, and writing the data into a second region of the memory.