RM0312 datasheet(242/275 Pages) STMICROELECTRONICS

242 / 275 page

Universal synchronous/asynchronous receiver transmitter (USART)

RM0312

242/275

DocID022352 Rev 3

21.4

USART low power modes

21.5

USART interrupts

Note:

The USART interrupt events are connected to two interrupt vectors (see Figure 94).

Transmission Complete or Transmit Data Register empty interrupt.

Idle line detection, Overrun error, Receive data register full, Parity error interrupt,

and Noise flag.

These events generate an interrupt if the corresponding enable control bit is set and the

interrupt mask in the CCR register is reset (RIM instruction).

Figure 94. USART interrupt mapping diagram

Table 50. USART interface behavior in low power modes

Mode

Description

Wait

No effect on USART.

USART interrupts cause the device to exit from Wait mode.

Halt

USART registers are frozen.

In Halt mode, the USART stops transmitting/receiving until Halt mode is exited.

Table 51. USART interrupt requests

Interrupt event

Event flag

Enable

control bit

Exit from

Wait

Exit from

Halt

Transmit data register empty

TXE

TIEN

Yes

Transmission complete

TCIEN

Yes

Received data ready to be read

RXNE

RIEN

Yes

Overrun error detected

Yes

Idle line detected

IDLE

ILIEN

Yes

Parity error

PIEN

Yes

TCIEN

TXE

TIEN

IDLE

ILIEN

RIEN

RXNE

PIEN

Transmitter Interrupt

Receiver Interrupt

RM0312 데이터시트(PDF) 242 Page - STMicroelectronics

RM0312 데이터시트(HTML) 242 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

데이터시트 다운로드

링크 URL