7643 datasheet(264/424 Pages) RENESAS

264 / 424 page

Rev.2.00

Aug 28, 2006

page 143 of 202

7643 Group

REJ09B0133-0200

APPLICATION

2.6 USB

Fig. 2.6.38 Control procedure (USB function interrupt routine)

USB function interrupt routine

RAM1

RAM2

(Address 5216) ?

(Address 5316) ?

RTI

Push registers to stack

Pop registers

USB endpoint x

IN interrupt routine

RAM1,bit0=1 or

RAM1,bit2=1 or

RAM1,bit4=1

RAM1,bit1=1 or

RAM1,bit3=1

USB endpoint x

OUT interrupt routine

RAM2,bit5=1

USB reset

interrupt routine

RAM2,bit6=1

USB resume

interrupt routine

RAM2,bit7=1

USB suspend

interrupt routine

• In the initial setting routine, enable each interrupt by ICONA (address 000516),

USBIE1 (address 005416) and USBIE2 (address 005516).

• USB interrupt status registers 1 and 2 cleared

Set “1” again to the corresponding bits of USBIS1, USBIS2 to clear these bits.

Read and push in the following order;

USBIS1

→ RAM1, USBIS2 → RAM2

Write in the following order;

RAM1

→ USBIS1, RAM2 → USBIS2 (Note 1)

Note 1: When the USB block is enabled (USBC7=1) and USB clock is enabled

(USBC5=1), writing to USB related registers (address 005016 to 006216)

except USBC can be enabled.

In the case of the resume interrupt, clear the USB resume signal interrupt

status flag in the USB resume interrupt routine.

7643 Datasheet(PDF) 264 Page - Renesas Technology Corp

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