Freescale Semiconductor, Inc.
Serial Communications Interface (SCI)
Status flags and interrupts
Note: The bit names shown are for SCI1. The
Begin
diagram 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
Yes
OR = 1?
RIE = 1?
RE = 1?
No
No
No
TDRE = 1?
TIE = 1?
TE = 1?
No
No
No
TC = 1?
TCIE = 1?
No
No
Yes
IDLE = 1?
ILIE = 1?
RE = 1?
No
No
No
No valid SCI
interrupt request
Valid SCI
interrupt request
Figure 5-3. Interrupt source resolution within SCI
MC68HC11P2 — Rev 1.0
Technical Data
Serial Communications Interface (SCI)
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