Hitachi HT-4139-28 Developer's Manual page 31

3 Operation Triplets
Note for when scanning process and ejection process are separated
The operation when scanning process and ejection process are separated is shown below.
Applications
Image process(1)
Image process(2)
TW_PENDINGXFERS.Count
Finish scanning
3-8
DG_CONTROL/
DAT_USERINTERFACE/
MSG_ENABLEDS
MSG_XFERREADY
DG_IMAGE/
DAT_IMGE***XFER/
MSG_GET
DG_CONTROL/
DAT_PENDINGXFERS/
MSG_ENDXFER
TW_PENDINGXFERS.
=0？
TWAI driver
Scanning (1)
Ejection (1)
Scanning (2)