MC68HC11PH8 Datasheet, PDF (106/264 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit

Begin
RDRF = 1? ^Yes
No
Note: The bit names shown are for SCI1. The diagram
applies equally to SCI2, when the appropriate bit
names are substituted.
OR = 1?
Yes
No
RIE = 1?
Yes
No
RE = 1?
Yes
No
5
TDRE = 1? ^Yes
TIE = 1?
Yes
TE = 1?
Yes
No
No
No
TC = 1?
Yes
No
TCIE = 1?
Yes
No
IDLE = 1? ^Yes
No
No valid SCI
interrupt request
ILIE = 1?
Yes
No
RE = 1?
No
Yes
Valid SCI
interrupt request
Figure 5-3 Interrupt source resolution within SCI
MOTOROLA
5-14
SERIAL COMMUNICATIONS INTERFACE
TPG
MC68HC11PH8