Datasheet

ST72321Rx ST72321ARx ST72321Jx
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SERIAL COMMUNICATIONS INTERFACE (Cont’d)
10.6.5 Low Power Modes 10.6.6 Interrupts
The SCI interrupt events are connected to the
same interrupt vector.
These events generate an interrupt if the corre-
sponding Enable Control Bit is set and the inter-
rupt mask in the CC register is reset (RIM instruc-
tion).
Mode Description
WAIT
No effect on SCI.
SCI interrupts cause the device to exit from
Wait mode.
HALT
SCI registers are frozen.
In Halt mode, the SCI stops transmitting/re-
ceiving until Halt mode is exited.
Interrupt Event
Event
Flag
Enable
Control
Bit
Exit
from
Wait
Exit
from
Halt
Transmit Data Register
Empty
TDRE TIE Yes No
Transmission Com-
plete
TC TCIE Yes No
Received Data Ready
to be Read
RDRF
RIE
Yes No
Overrun Error Detect-
ed
OR Yes No
Idle Line Detected IDLE ILIE Yes No
Parity Error PE PIE Yes No