TUSB6250 datasheet(49/124 Pages) TI

49 / 124 page

8−8

SLLS535A − January 2004

TUSB6250

8.3.2.4

The seven enable bits listed in Table 8−1 greatly affect the behavior and function of the WAKCLK interrupt

function.

Table 8−1. Register Setting for the WAKCLK Interrupt and Remote Wakeup

BIT NAME

BIT LOCATION

IN REGISTER

FUNCTION CONTROLLED

LPEN

USBCTL [6]

Low power enable.

LPEN controls whether the core clock of the TUSB6250 is shut down when the TUSB6250 enters the USB

suspend state.

WAKCLK

USBMSK [2]

WAKCLK interrupt enable. WAKCLK controls:

S Whether the WAKCLK interrupt is generated when VBUS or any other status change events occur.

S Whether the core clock of the TUSB6250 is awakened in the suspend state along with the RWUPEN bit

setting.

RWUPEN

USBCTL [5]

Remote wakeup enable. RWUPEN controls:

S Whether the core clock of the TUSB6250 is awakened in the suspend state along with the WAKCLK bit

setting.

S Whether the USB resume signaling is sent to the upstream USB host when any remote wakeup event occurs

at either the VBUS pin or any of the four remote wakeup capable GPIOs.

P34STEN

MCUCNFG [2]

GPIO port3.4 status change detection enable.

P34STEN allows the firmware to enable/disable the status change detection on the port3.4 pin.

P35STEN

MCUCNFG [3]

GPIO port3.5 status change detection enable.

P35STEN allows the firmware to enable/disable the status change detection on the port3.5 pin.

CD1STEN

MCUCNFG [4]

Card detection-1 status change enable.

CD1STEN allows the firmware to enable/disable the status change detection on the port3.2 pin.

CD2STEN

MCUCNFG [5]

Card detection-2 status change enable.

CD2STEN allows the firmware to enable/disable the status change detection on the port3.3 pin.

In summary, to configure the WAKCLK interrupt and remote wakeup, it is important to ensure that:

•

When the remote wakeup is desired (this means sending resume signaling to the host is desired), both

WAKCLK and RWUPEN must be set.

•

If the remote wakeup is not desired (this means no resume signaling to the host is desired), while the end

product application can not afford losing any status change event that might occur when the TUSB6250

is in the USB suspend state, the WAKCLK bit can be set, while the RWUPEN bit can be disabled.

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