CP2102 datasheet(22/36 Pages) SILABS

22 / 36 page

AN169

Rev. 2.3

4.7. USB_Int_Disable

Description:

This function disables the USB API interrupt generation.

Supported Devices:

C8051F320/1/6/7, C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D,

C8051F380/1/2/3/4/5/6/7, C8051T320/1/2/3/6/7, C8051T620/1/2/3

Prototype:

void USB_Int_Disable (void)

Parameters:

None

Return Value:

None

4.8.

USB_Disable

Description:

This function disables the USB interface and the use of Device Interface Functions. On return,

the USB interface is no longer available and API interrupts are turned off. The clock multiplier is

turned off to reduce power consumption unless the system clock is set to the

'4x Clock Multiplier/2' option (CLKSEL[1:0] = 10b).

Supported Devices:

C8051F320/1/6/7, C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D,

C8051F380/1/2/3/4/5/6/7, C8051T320/1/2/3/6/7, C8051T620/1/2/3

Prototype:

void USB_Disable (void)

Parameters:

None

Return Value:

None

4.9.

USB_Suspend

Description:

This function allows devices to meet the USB suspend current specification. To be USB compli-

ant, a USB device must support the Suspend feature by reducing its total power consumption to

be under 500 µA. This function should only be called when the DEV_SUSPEND USB API inter-

rupt is received. All unnecessary user peripherals should be turned off before making this func-

tion call, and can be turned back on after the call returns. This routine powers down the USB

transceiver and the clock multiplier and then suspends the internal oscillator until USB resume

signaling occurs. Once USB traffic is detected, internal oscillator is restarted, USB_Clock_Start is

called, and then the function call returns to user code. Note: USB_Suspend will set the system

clock to internal oscillator by default. If system clock is set to clock multiplier when

USB_Suspend is called, that setting will be restored before this function returns. If it is necessary

to use any other setting for system clock, user code should modify CLKSEL on return from

USB_Suspend.

Supported Devices:

C8051F320/1/6/7, C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D,

C8051F380/1/2/3/4/5/6/7, C8051T320/1/2/3/6/7, C8051T620/1/2/3

Prototype:

void USB_Suspend (void)

Parameters:

None

Return Value:

None

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