MC68HC11P2 Datasheet, PDF (103/268 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Serial Communications Interface (SCI)
Status flags and interrupts
Begin
RDRF = 1?
Yes
No
OR = 1?
Yes
No
TDRE = 1?
Yes
No
TC = 1?
Yes
No
IDLE = 1?
Yes
No
No valid SCI
interrupt request
Note: The bit names shown are for SCI1. The
diagram applies equally to SCI2 and SCI3,
when the appropriate bit names are
substituted.
RIE = 1?
Yes
No
TIE = 1?
Yes
No
TCIE = 1?
Yes
No
ILIE = 1?
Yes
No
RE = 1?
Yes
No
TE = 1?
Yes
No
RE = 1?
No
Yes
Valid SCI
interrupt request
Figure 5-3. Interrupt source resolution within SCI
MC68HC11P2 — Rev 1.0
Serial Communications Interface (SCI)
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Technical Data