Fujitsu F2MC-16LX Hardware Manual page 323

16-bit microcontroller mb90330 series

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Figure 13.4-12 IN Direction (Device → Host PC) Forwarding

Write PKS part of

DMA sending buffer

In both OUT- direction and IN- direction transfer, a USB device must perform processes in the following

1. It sets the total number of pieces of data to be transferred in the data counter register DDCT in DMA

and enables DMA with the DER register.

2. DMAE and DRQIE, are permitting set.

3. Once transfer has been completed, it sets µDMAC again with an interrupt due to the corresponding

interrupt factor in the DSR register of µDMAC and clear the flag if necessary, and returns from the

interrupt process.

*:EP1 to EP5 consists of the double buffers, it can be cleared only when one buffer that is not being

accessed has already data written into it and data is written into another buffer that is being accessed and

cannot be cleared when one buffer that is not being accessed is empty. It continuously enters the DRQ

interrupt process.

Write the rest of

DMA sending buffer

CHAPTER 13 USB FUNCTION