Renesas SH7641 Manual De Usuario

Section 20   USB Function Module 

 

 

Rev. 4.00  Sep. 14, 2005  Page 775 of 982 

 

 REJ09B0023-0400 

USB function

Application

OUT token reception

Data reception from host

Set EP1 FIFO full status

(USBIFR0/EP1 FULL = 1)

Clear EP1 FIFO full status

(USBIFR0/EP1 FULL = 0)

Read USBEP1 receive data

size register (USBEPSZ1)

Read data from USBEP1

data register (USBEPDR1)

Write 1 to EP1 read

complete bit

(USBTRG/EP1 RDFN = 1)

Space

in EP1 FIFO?

No

Yes

Both

EP1 FIFOs empty?

No

Yes

NACK

ACK

Interrupt request

Interrupt request