ST72321R7-Auto datasheet(146/243 Pages) STMICROELECTRONICS

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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

12345678910

sampled values

One bit time

6/16

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

Transmission Complete

TCIE

Yes

Received Data Ready to be Read

RDRF

RIE

Yes

Overrun Error Detected

Yes

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