Samsung YP-P10 User Manual download pdf (Page 363)

USB DEVICE S3C2440A RISC MICROPROCESSOR

13-8

INTERRUPT REGISTER (EP_INT_REG/USB_INT_REG) (Continued)

Register Address R/W Description Reset Value

USB_INT_REG 0x52000158(L)

0x5200015B(B)

R/W

(byte)

USB interrupt pending/clear register 0x00

USB_INT_REG Bit MCU USB Description Initial State

RESET

Interrupt

[2] R

/CLEAR

SET Set by the USB when it receives reset

signaling.

0

RESUME

Interrupt

[1] R

/CLEAR

SET Set by the USB when it receives resume

signaling, while in Suspend mode.

If the resume occurs due to a USB reset, then

the MCU is first interrupted with a RESUME

interrupt. Once the clocks resume and the SE0

condition persists for 3ms, USB RESET

interrupt will be asserted.

0

SUSPEND

Interrupt

[0] R

/CLEAR

SET Set by the USB when it receives suspend

signalizing.

This bit is set whenever there is no activity for

3ms on the bus. Thus, if the MCU does not

stop the clock after the first suspend interrupt, it

will continue to be interrupted every 3ms as

long as there is no activity on the USB bus.

By default, this interrupt is disabled.

0

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