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STMPE1601 Datasheet(PDF) 21 Page - STMicroelectronics

No. de pieza STMPE1601
Descripción Electrónicos  16-bit enhanced port expander with keypad and PWM controller Xpander Logic
PDF  58 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STMPE1601 Datasheet(HTML) 21 Page - STMicroelectronics

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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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