STMPE2401 datasheet(19/55 Pages) STMICROELECTRONICS

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STMPE2401

System controller

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7.2

System control register

Table 18. System control register

Bit

Soft_Reset

Disable_32KHz Sleep Enable_GPIO Enable_PWM Enable_KPC Enable_ROT

Read/Writ

e (IIC)

WRW

Read/Writ

e(HW)

Reset

Value

Table 19. System control register writing

Bits

Name

Description

Enable_ROT

Writing a ‘0’ to this bit will gate off the clock to the Rotator module, thus stopping

its operation

Enable_KPC

Writing a ‘0’ to this bit will gate off the clock to the Keypad Controller module,

thus stopping its operation

Enable_PWM

Writing a ‘0’ to this bit will gate off the clock to the PWM module, thus stopping

its operation

Enable_GPIO

Writing a ‘0’ to this bit will gate off the clock to the GPIO module, thus stopping

its operation

Sleep

Writing a ‘1’ to this bit will put the device in sleep mode. When in sleep mode, all

the units which need to work on clocks synchronous to 32KHz will get the clocks

derived from the 32K domain. The RC Oscillator will be shut off.

Disable_32KHz

Set this bit to disable the 32KHz OSC, thus putting the device in hibernate

mode. Only a Reset or a wakeup on IIC will reset this bit

Soft_Reset

Writing a ‘1’ to this bit will do a soft reset of the device. Once the reset is done,

this bit will be cleared to ‘0’ by the HW.

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