There is some strange thing about the interrupt of keypad module. Some times too slow to send the key release interrupt, using same click on keypad，but sometimes keypad interrupt comes within 100ms，sometime 1s. The problem is caused by clock source, but the keypad controller of am572x has no other clock source, so the problem still no resolved. We often purchase the Keypad Module not realising that this is a discontinued product.

Handheld Computer Accessories Co.,LTD. is a leader among handheld Computer repair parts accessories for replacement suppliers. Our company concentrates on the development and production of handheld computer accessories. Handheld Computer Accessories Co.,LTD. is American handheld computer repair parts accessories for replacement company located in Los Angeles. Our main focus is creating the highest quality products. The main products are handheld computer accessories, barcode scanner accessories, barcode printer accessories.

The size of handheld computers ranges from credit card to small notebook computer, and the available features and power generally increase with greater size. Most handheld computers utilize a liquid crystal display (LCD), which acts as both an input and an output device.

Handheld computers—also known as personal digital assistants (PDAs)—are small, portable devices that offer users many of the same features and capabilities as desktop computers at a fraction of the size. Although the terms "handheld computer" and "PDA" are often used interchangeably, handhelds tend to be larger and feature miniature keyboards, while PDAs tend to be smaller and rely on a touch screen and stylus for data entry.

The term MC9090 touch screen is interchangeable with the term digitizer. You’ll often see the combined terms Digitizer Touch Screen offered as a repair service. A touch screen is an electronic input device that the user can control with single or multi-touch gestures. The touchscreen enables the user to interact directly with what is being displayed, rather than using a mouse, touchpad, or any other intermediate device. Some touch screens can be controlled by fingers; others may require the use of gloves with a particular type of coating, or the use of a special stylus pen.