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HT9201B Datasheet(PDF) 2 Page - Holtek Semiconductor Inc |
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HT9201B Datasheet(HTML) 2 Page - Holtek Semiconductor Inc |
2 / 7 page Keyboard Information Block Diagram Pin Description Pin Name I/O Internal Connection Description C1~C4 R1~R4 I/O CMOS IN/OUT These pins form a 4 ×4 keyboard matrix which can perform keyboard input detection and dialing specification setting functions. When the chip is in the standby mode the column group (C1~C4) remains low whereas the row group (R1~R4) is set high for key input detection. An inexpensive single contact 4 ×4 keyboard can be used as an input device. Pressing a key connects a single column to a single row, and actuates the system oscillator which result in a dialing signal output. If more than two keys are pressed at a time, no response occurs. The key-in debounce time is 20ms. Refer to the keyboard information for keyboard arrangement. HT9201A/B 2 3rd Dec ’97 |
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