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STMPE1601 数据表(PDF) 21 Page - STMicroelectronics |
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STMPE1601 数据表(HTML) 21 Page - STMicroelectronics |
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21 / 58 page  STMPE1601 Clocking system 21/58 8 Clocking system Figure 5. Clocking system The decision on clocks is based on the bits written into the SYS_CTRL registers. Bits 0 to 4 of the SYS_CTRL register allow to 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 STMPE1601 powers up, it derives a 32 KHz clock from the internal RC oscillator for its operation. If an external clock source is available, it must be configured to accept an external clock through the SYS_CTRL register. Reset control: There are 4 sources of reset: ● Reset_N pin ● LVD reset ● Soft reset bit of the SYS_CTRL register ● I2C reset from the I2C block. Internal RC OSC Clock control System control register SCLK Pin CLK_IN System clock |
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