Rainbow Electronics AT89C51SND1C - Manual (Page 122)

122
AT8xC51SND1C
4109E–8051–06/03
This time-out may be disarmed after receiving 8 data (F1FI flag set) or after receiving
end of frame (EOFI flag set) in case of block length less than 8 data (1, 2 or 4).
Data Reading Data is read from the FIFO by reading to MMDAT register. Each time one FIFO
becomes full (F1FI or F2FI set), user is requested to flush this FIFO by reading 8 data.
Figure 87. Data Stream Reception Flows
Data Stream
Reception
FIFO Full?
F1FI or F2FI = 1?
FIFO Reading
read 8 data from MMDAT
No More Data
To Receive?
a. Polling mode
Data Stream
Initialization Data Stream
Reception ISR
FIFO Reading
read 8 data from MMDAT
Send
STOP Command
No More Data
To Receive?
b. Interrupt mode
FIFO Full?
F1FI or F2FI = 1?
Unmask FIFOs Full
F1FM = 0
F2FM = 0
Send
STOP Command
Mask FIFOs Full
F1FM = 1
F2FM = 1