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TTP258 Datasheet(PDF) 11 Page - Tontek Design Technology |
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TTP258 Datasheet(HTML) 11 Page - Tontek Design Technology |
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11 / 44 page  Preliminary TTP258 TonTouch TM 16’/04/06 Page 11 of 44 Ver.: 1.2 § System function description: S-1: System Oscillator The high-speed oscillator is operated in built-in RC mode. Built-in RC oscillator is fixed 4MHz S-2: Peripheral Oscillator The low speed oscillator was built-in an internal RC oscillator that is for low power consumption consideration and fixed peripheral device timing control. Built-in RC oscillator and the frequency range between 12 KHz ~ 21 KHz. S-3: CPU clock The CPU clock comes from system/peripheral oscillator which was controlled by H/L bit in PS register. In the normal operation, the system clock comes from high-speed system oscillator (OSCH/2). The low speed operation frequency (OSCL/2) comes from RC oscillator. Figure: System Oscillator & CPU Clock Sources Figure: System High Speed Oscillator RC oscillator OSCEN OSCH 16K Hz (Built-in RC) 1 0 CPU machine H/L M U X Peripheral clock OSCL (16K Hz) OSC TBCK /2 |
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