STMPE1601 datasheet(21/58 Pages) STMICROELECTRONICS

Part #	STMPE1601

Description	16-bit enhanced port expander with keypad and PWM controller Xpander Logic

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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STMPE1601

Clocking system

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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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