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Serial communications interface (SCI) ST72321xx-Auto
146/243 Doc ID 13829 Rev 1
Figure 65. Bit sampling in reception mode
15.5 Low power modes
15.6 Interrupts
The SCI interrupt events are connected to the same interrupt vector.
These events generate an interrupt if the corresponding Enable Control Bit is set and the
interrupt mask in the CC register is reset (RIM instruction).
RDI LINE
Sample
clock
1234567891011
12
13 14 15 16
sampled values
One bit time
6/16
7/16
7/16
Table 71. Effect of low power modes on SCI
Mode Effect
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/receiving until Halt mode is exited.
Table 72. SCI interrupt control/wake-up capability
Interrupt event Event flag
Enable control
bit
Exit from
Wait
Exit from
Halt
Transmit Data Register Empty TDRE TIE Yes No
Transmission Complete TC TCIE Yes No
Received Data Ready to be Read RDRF
RIE
Ye s N o
Overrun Error Detected OR Yes No
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