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STMPE2403 Datasheet(PDF) 23 Page - STMicroelectronics |
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STMPE2403 Datasheet(HTML) 23 Page - STMicroelectronics |
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23 / 63 page  STMPE2403 Clocking system 23/63 8 Clocking system Figure 5. Clocking system The decision on clocks is based on the bits written into SYSCON registers. Bits 0 to 4 of the SYSCON register control the gating of clocks to the Rotator, Keypad Controller, PWM and GPIO respectively in the operational mode. 8.1 Clock source By default, when the STMPE2403 powers up, it derives a 32KHz clock from the internal RC oscillator for it's operation. If external 32KHz crystal or clock source is available, it must be configured to accept external clock through the SYSCON register. In the case where the STMPE2403 is powered and configured to use external clock, and the XTALIN is left floating, there will be an additional leakage current of approximately 20 µA drawn from the VCC. |
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