Motorola MPC533 Reference Manual page 685

15.8.12 Example QSCI1 Receive Operation of 17 Data Frames
Figure 15-41 shows an example receive operation of 17 data frames. The bold type
indicates the current value for the QRPNT. Action of the queue may be followed by starting
at the top of the figure and going left to right and then down the page.
1
Receive Queue Enabled
QRPNT
0000
SCRQ[0]
SCRQ[7]
0111
SCRQ[8]
1000
SCRQ[15]
1111
3
QBHF Interrupt Received
QRPNT
0000
SCRQ[0]
SCRQ[7]
0111
SCRQ[8]
1000
SCRQ[15]
1111
Read SCRQ[8:15]
Clear QBHF
Figure 15-41. Queue Receive Example for 17 Data Bytes
MOTOROLA
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Chapter 15. Queued Serial Multi-Channel Module
QTHF Interrupt Received
2
QRPNT
0000
SCRQ[0]
SCRQ[7]
0111
SCRQ[8]
1000
SCRQ[15]
1111
Read SCSR and SCRQ[0:7]
Clear QTHF
4
IDLE Interrupt Received
QRPNT
0000
SCRQ[0]
0001
SCRQ[7]
0111
SCRQ[8]
1000
SCRQ[15]
1111
Read SCRQ[0]
Clear QRE/RE
SCI Queue Operation
Data
Received
Available
Space
15-79