Rainbow Electronics AT89C51SND1C - Manual (Page 120)

120
AT8xC51SND1C
4109E–8051–06/03
Figure 85. Data Stream Transmission Flows
Send
STOP Command
Data Stream
Transmission
Start Transmission
DATEN = 1
DATEN = 0
FIFO Empty?
F1EI or F2EI = 1?
FIFO Filling
write 8 data to MMDAT
No More Data
To Send?
FIFOs Filling
write 16 data to MMDAT
a. Polling mode
Data Stream
Initialization
FIFOs Filling
write 16 data to MMDAT
Data Stream
Transmission ISR
FIFO Filling
write 8 data to MMDAT
Send
STOP Command
No More Data
To Send?
b. Interrupt mode
FIFO Empty?
F1EI or F2EI = 1?
Start Transmission
DATEN = 1
DATEN = 0
Unmask FIFOs Empty
F1EM = 0
F2EM = 0
Mask FIFOs Empty
F1EM = 1
F2EM = 1