H8SX1663 datasheet(856/1158 Pages) RENESAS

tên linh kiện	H8SX1663

Giải thích chi tiết về linh kiện	Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series

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Section 16 USB Function Module (USB)

Rev.1.00 Jun. 07, 2006 Page 804 of 1102

REJ09B0294-0100

16.5.7

EP3 Interrupt-In Transfer

USB function

Application

IN token reception

Data transmission to host

Set EP3 transmission

complete flag

(IFR1.EP3 TS = 1)

Write data to EP3 data

Write 1 to EP3 packet

enable bit

(TRG.EP3 PKTE = 1)

Clear EP3 transmission

complete flag

(IFR1.EP3 TS = 0)

Write data to EP3 data

Write 1 to EP3 packet

enable bit

(TRG.EP3 PKTE = 1)

Valid data

in EP3FIFO?

Is there data

for transmission

to host?

Is there data

for transmission

to host?

Yes

NACK

ACK

Note: This flowchart shows just one example of interrupt transfer processing. Other possibilities include an

operation flow in which, if there is data to be transferred, the EP3 DE bit in the data status register is

referenced to confirm that the FIFO is empty, and then data is written to the FIFO.

Interrupt request

Figure 16.17 Operation of EP3 Interrupt-In Transfer

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