Motorola MPC533 Reference Manual page 680

SCI Queue Operation
15.8.8 QSCI1 Receiver Block Diagram
The block diagram of the enhancements to the SCI receiver is shown below in
Figure 15-38.
Receiver Baud Rate
Clock
RxD
SCI1 Non-Queue Operation
Queue Control
Figure 15-38. Queue Receiver Block Enhancements
15.8.9 QSCI1 Additional Receive Operation Features
Additional QSCI1 features include:
• Available on a single SCI channel (SCI1) implemented by the queue receiver enable
(QRE) bit set by software. When the queue is enabled, software should ignore the
RDRF bit.
15-74
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
10 (11) - Bit
Rx Shift Register
H (8) 7 6 5 4 3 2 1 0 L
SCxDR Rx BUFFER
4-bits
Queue Control
Queue Status
MPC533 Reference Manual
SCRQ[0]
SCRQ[1]
SCRQ[15]
Logic
SCI Interrupt Request
Data Bus
MOTOROLA