7643 datasheet(248/424 Pages) RENESAS

248 / 424 page

Rev.2.00

Aug 28, 2006

page 127 of 202

7643 Group

REJ09B0133-0200

APPLICATION

2.6 USB

2.6.6 USB interrupts

(1)

USB function interrupt

The USB function interrupts is used for data flow control as well as USB power management. In

order to use a USB function interrupt, set the Interrupt disable flag (I) to “0” and USB function

interrupt enable bit of interrupt control register A (address 000516, bit 0) to “1”. In addition, set all

bits corresponding to USB interrupt enable register 1 (address 005416) and USB interrupt enable

Endpoint x IN interrupt, endpoint x OUT interrupt

An interrupt request occurs when the following flag is set to “1”.

USB endpoint x IN/OUT interrupt status flag of USB interrupt status register 1 or 2 (addresses

005216, 005316)

Endpoints 1 and 2 have two interrupt status bits (IN and OUT) each and endpoint 0 has one

interrupt status bit. Each interrupt status flag is set to “1” under any of the following conditions.

- USB endpoint 0 interrupt status flag (INTST0) (when using endpoint 0)

Endpoint 0: one packet successfully received, or

Endpoint 0: one packet successfully transmitted, or

DATA_END bit is “0”, or

FORCE_STALL flag is “1”, or

SETUP_END flag is “1”.

- USB endpoint x (x = 1, 2) IN interrupt status flag (INTST2, 4) (when using endpoints 1, 2):

Endpoint x (x = 1, 2): one packet data successfully transmitted

- USB endpoint x (x = 1, 2) OUT interrupt status flag (INTST3, 5) (when using endpoints 1, 2):

Endpoint x (x = 1, 2): one packet data successfully received, or

FORCE_STALL flag is “1”.

q Reset interrupt

An interrupt request occurs when the USB reset interrupt status flag of USB interrupt status

detects SE0 for a period of 2.5 ms on the D+/D- line by the USB FCU.

At USB reset, all USB internal registers (addresses 005016 to 005F16) bits, excluding this bit, are

initialized. Initialize each endpoint when new data transfer is received from the host CPU.

q Resume signal interrupt

An interrupt request occurs when the USB resume signal interrupt status flag of the USB

interrupt status register 2 (address 005316) is “1”.

The USB resume signal interrupt status flag is set to “1” if a non-idle signal is detected on the

D+/D- line when the USB FCU is in the suspend mode. Also, the USB resume signal interrupt

status flag is set to “1” even when the MCU returns from the suspend mode by a remote wake-

up (INT interrupt, etc.) and the USB remote wake-up bit is set to “1”.

q Suspend signal interrupt

An interrupt request occurs when the USB suspend signal interrupt status flag of the USB

interrupt status register 2 (address 005316) is “1”.

This flag is set to “1” if no activity is detected on the D+/D- line for a period of 3ms.

The MCU returns from the suspend state with a USB resume interrupt or remote wake-up.

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