Freescale Semiconductor, Inc.
Resets and Interrupts
Low power operation
Note: The bit names shown are for SCI1. The diagram
Begin
applies equally to SCI2 and SCI3, when the
appropriate bit names are substituted.
Yes
Yes
Yes
Yes
Yes
RDRF = 1?
No
Yes
Yes
Yes
Yes
Yes
OR = 1?
No
RIE = 1?
RE = 1?
No
No
Yes
TDRE = 1?
No
TIE = 1?
TE = 1?
No
No
TC = 1?
No
TCIE = 1?
No
Yes
IDLE = 1?
No
ILIE = 1?
No
RE = 1?
No
No valid SCI
interrupt request
Valid SCI
interrupt request
Figure 10-6. Interrupt source resolution within the SCI subsystem
MC68HC11P2 — Rev 1.0
Technical Data
Resets and Interrupts
For More Information On This Product,
Go to: www.freescale.com