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RM0312 датащи(PDF) 242 Page - STMicroelectronics |
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RM0312 датащи(HTML) 242 Page - STMicroelectronics |
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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: 1 The USART interrupt events are connected to two interrupt vectors (see Figure 94). a) Transmission Complete or Transmit Data Register empty interrupt. b) Idle line detection, Overrun error, Receive data register full, Parity error interrupt, and Noise flag. 2 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 No Transmission complete TC TCIEN Yes No Received data ready to be read RXNE RIEN Yes No Overrun error detected OR Yes No Idle line detected IDLE ILIEN Yes No Parity error PE PIEN Yes No TC TCIEN TXE TIEN IDLE ILIEN RIEN OR RIEN RXNE PE PIEN Transmitter Interrupt Receiver Interrupt |
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