AT85C51SND3B Datasheet, PDF (198/270 Pages) ATMEL Corporation – Single-Chip Digital Audio Decoder - Encoder with USB 2.0 Interface

Figure 91. Data Stream Transmission Flows
Data Stream
Transmission
Start Transmission
DATEN = 1
FIFO Filling
write 16 data to MMDAT
FIFO Empty?
HFRS = 1?
FIFO Filling
write 8 data to MMDAT
No More Data
To Send?
Send
STOP Command
a. Polling mode
Data Stream
Initialization
Start Transmission
DATEN = 1
Unmask FIFO Empty
HFRM = 0
FIFO Filling
write 16 data to MMDAT
Data Stream
Transmission ISR
FIFO Empty?
HFRI = 1?
FIFO Filling
write 8 data to MMDAT
No More Data
To Send?
Mask FIFO Empty
HFRM = 1
Send
STOP Command
b. Interrupt mode
198 AT85C51SND3B
7632C–MP3–11/06