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LC75700T Datasheet(PDF) 10 Page - Sanyo Semicon Device |
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LC75700T Datasheet(HTML) 10 Page - Sanyo Semicon Device |
10 / 16 page Key Scan Operation Functions 1.Key scan timing The key scan period is 288T (s). To reliably determine the on/off state of the keys, this LSI scans the keys twice and determines that a key has been pressed when the key data agrees. It outputs a key data read request (a low level on DO) 615T (s) after starting a key scan. If the key data does not agree and a key was pressed at that point, it scans the keys again. Thus this LSI cannot detect a key press shorter than 615T (s). 2.Key scan operation •The pins KS1 to KS6 are set to the high or low state by the control data. •If a key on one of the lines corresponding to a KS1 to KS6 pin which is set high is pressed, the oscillator on the OSC pin is started and a key scan is performed. Keys are scanned until all keys are released. Multiple key presses are recognized by determining whether multiple key data bits are set. •If a key is pressed for longer than 615T (s) (where T = 1/fosc) this LSI outputs a key data read request (a low level on DO) to the controller. The controller acknowledges this request and reads the key data. However, if CE is high during a serial data transfer, Do will be set high. •After the controller reads the key data, the key data read request is cleared (DO is set high) and this LSI performs another key scan. Also note that DO being an open-drain output, requires a pull-up resistor (between 1 k Ω and 10 kΩ) . No. 7632-10/16 LC75700T Key on *2. Not that the high/low states of these pins are determined by the control data, and that key scan output signals are not output from pins that are set to low . 576T[s] *2 1 1 2 2 3 3 4 4 5 5 6 6 KS4 KS5 KS6 KS3 KS2 *2 KS1 T= 1 fosc *2 *2 *2 *2 *2 *2 *2 *2 *2 *2 Serial data transfer Key data read request Key data read Key data read Key data read DO DI Key address (63H) Key address CE Key scan Key input 2 Key input 1 615T[s] Key data read request Key data read request 615T[s] 615T[s] Serial data transfer Serial data transfer Key address T= 1 fosc |
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