UPD360 datasheet(40/221 Pages) MICROCHIP

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UPD360

DS00002084C-page 40

 2016-2017 Microchip Technology Inc.

Software programs the General Purpose Timer Load Register (GP_TIMER_LOAD) to a random value that com-

plies with the range for tDRP period as defined in the USB Type-C Specification.

Software sets the ENABLE, RESET and DIS_ON_UFLOW bits in the General Purpose Timer Control Register

(GP_TIMER_CTL). This causes the value in the General Purpose Timer Load Register (GP_TIMER_LOAD) to

be loaded into the timer and it begins decrementing. This also configures the timer to delay assertion of GP_U-

FLOW in the General Purpose Timer Interrupt Source Register (GP_TIMER_INT_SRC) until the timer is fully dis-

abled .

APPLICATION NOTE: Writes to General Purpose Timer Load Register (GP_TIMER_LOAD) and General Purpose

Timer Control Register (GP_TIMER_CTL) defined in the prior steps may be done in the

same I2C write burst.

Upon timer expiration, the GP_UFLOW bit will be set and the GP_TIMER_INT asserts in Interrupt Status Register

(INT_STS).

The IRQ_N pin asserts.

Software services the IRQ and determines whether or not a connection has been established with a UFP, or DFP.

If no connection has been established, software changes the device’s role. See Section 9.4, "DRP Operation" for

further details.

Software programs the General Purpose Timer Load Register (GP_TIMER_LOAD) to a random value that com-

plies with the range of the tDRP period as defined in the USB Type-C Specification.

Software shall clear the GP_UFLOW bit in the General Purpose Timer Interrupt Source Register (GP_TIM-

ER_INT_SRC).

10. Software sets the ENABLE, RESET and DIS_ON_UFLOW bits in General Purpose Timer Control Register (GP_-

TIMER_CTL). This causes the value in General Purpose Timer Load Register (GP_TIMER_LOAD) to be loaded

into the timer and the timer begins decrementing.

APPLICATION NOTE: Writes to the General Purpose Timer Load Register (GP_TIMER_LOAD), General Purpose

Timer Interrupt Source Register (GP_TIMER_INT_SRC) and General Purpose Timer Control

burst.

11. Upon timer expiration, and timer disablement, the GP_UFLOW bit will be set and the GP_TIMER_INT asserts in

Interrupt Status Register (INT_STS).

12. The IRQ_N pin asserts.

13. Software services the IRQ and determines if a connection has been established with a UFP, or DFP. If no con-

nection has been established SW changes the device’s role. See Section 9.4, "DRP Operation" for further details.

14. Goto step 8.

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