STMPE1601 STMicroelectronics, STMPE1601 Datasheet - Page 22

• Manufacturer Part Number: STMPE1601
• Description: 16-bit Enhanced Port Expander With Keypad And Pwm Controller Xpander Logic
• Manufacturer: STMicroelectronics

Clocking system
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8.1
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Clocking system
Figure 5.
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.
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:
●
●
●
●
SCLK Pin
Reset_N pin
LVD reset
Soft reset bit of the SYS_CTRL register
I
2
CLK_IN
C reset from the I
Clocking system
Internal RC
OSC
2
C block.
System control register
Clock control
System clock
STMPE1601