Expand description
LPUART control register 1 [alternate]
Structs
LPUART control register 1 [alternate]
Register CR1_disabled reader
Register CR1_disabled writer
Type Definitions
Field CMIE reader - Character match interrupt enable This bit is set and cleared by software.
Field CMIE writer - Character match interrupt enable This bit is set and cleared by software.
Field DEAT reader - Driver Enable assertion time This 5-bit value defines the time between the activation of the DE (Driver Enable) signal and the beginning of the start bit. It is expressed in lpuart_ker_ck clock cycles. For more details, refer . This bitfield can only be written when the LPUART is disabled (UEÂ =Â 0).
Field DEAT writer - Driver Enable assertion time This 5-bit value defines the time between the activation of the DE (Driver Enable) signal and the beginning of the start bit. It is expressed in lpuart_ker_ck clock cycles. For more details, refer . This bitfield can only be written when the LPUART is disabled (UEÂ =Â 0).
Field DEDT reader - Driver Enable deassertion time This 5-bit value defines the time between the end of the last stop bit, in a transmitted message, and the de-activation of the DE (Driver Enable) signal.It is expressed in lpuart_ker_ck clock cycles. For more details, refer control and RS485 Driver Enable. If the LPUART_TDR register is written during the DEDT time, the new data is transmitted only when the DEDT and DEAT times have both elapsed. This bitfield can only be written when the LPUART is disabled (UEÂ =Â 0).
Field DEDT writer - Driver Enable deassertion time This 5-bit value defines the time between the end of the last stop bit, in a transmitted message, and the de-activation of the DE (Driver Enable) signal.It is expressed in lpuart_ker_ck clock cycles. For more details, refer control and RS485 Driver Enable. If the LPUART_TDR register is written during the DEDT time, the new data is transmitted only when the DEDT and DEAT times have both elapsed. This bitfield can only be written when the LPUART is disabled (UEÂ =Â 0).
Field FIFOEN reader - FIFO mode enable This bit is set and cleared by software.
Field FIFOEN writer - FIFO mode enable This bit is set and cleared by software.
Field IDLEIE reader - IDLE interrupt enable This bit is set and cleared by software.
Field IDLEIE writer - IDLE interrupt enable This bit is set and cleared by software.
Field M0 reader - Word length This bit is used in conjunction with bit 28 (M1) to determine the word length. It is set or cleared by software (refer to bit 28 (M1) description). This bit can only be written when the LPUART is disabled (UEÂ =Â 0).
Field M0 writer - Word length This bit is used in conjunction with bit 28 (M1) to determine the word length. It is set or cleared by software (refer to bit 28 (M1) description). This bit can only be written when the LPUART is disabled (UEÂ =Â 0).
Field M1 reader - Word length This bit must be used in conjunction with bit 12 (M0) to determine the word length. It is set or cleared by software. M[1:0]
= ’00â: 1 Start bit, 8 Data bits, n Stop bit M[1:0]
= ’01â: 1 Start bit, 9 Data bits, n Stop bit M[1:0]
= ’10â: 1 Start bit, 7 Data bits, n Stop bit This bit can only be written when the LPUART is disabled (UEÂ =Â 0). Note: In 7-bit data length mode, the Smartcard mode, LIN master mode and Auto baud rate (0x7F and 0x55 frames detection) are not supported.
Field M1 writer - Word length This bit must be used in conjunction with bit 12 (M0) to determine the word length. It is set or cleared by software. M[1:0]
= ’00â: 1 Start bit, 8 Data bits, n Stop bit M[1:0]
= ’01â: 1 Start bit, 9 Data bits, n Stop bit M[1:0]
= ’10â: 1 Start bit, 7 Data bits, n Stop bit This bit can only be written when the LPUART is disabled (UEÂ =Â 0). Note: In 7-bit data length mode, the Smartcard mode, LIN master mode and Auto baud rate (0x7F and 0x55 frames detection) are not supported.
Field MME reader - Mute mode enable This bit activates the Mute mode function of the LPUART. When set, the LPUART can switch between the active and Mute modes, as defined by the WAKE bit. It is set and cleared by software.
Field MME writer - Mute mode enable This bit activates the Mute mode function of the LPUART. When set, the LPUART can switch between the active and Mute modes, as defined by the WAKE bit. It is set and cleared by software.
Field PCE reader - Parity control enable This bit selects the hardware parity control (generation and detection). When the parity control is enabled, the computed parity is inserted at the MSB position (9th bit if MÂ =Â 1; 8th bit if MÂ =Â 0) and parity is checked on the received data. This bit is set and cleared by software. Once it is set, PCE is active after the current byte (in reception and in transmission). This bitfield can only be written when the LPUART is disabled (UEÂ =Â 0).
Field PCE writer - Parity control enable This bit selects the hardware parity control (generation and detection). When the parity control is enabled, the computed parity is inserted at the MSB position (9th bit if MÂ =Â 1; 8th bit if MÂ =Â 0) and parity is checked on the received data. This bit is set and cleared by software. Once it is set, PCE is active after the current byte (in reception and in transmission). This bitfield can only be written when the LPUART is disabled (UEÂ =Â 0).
Field PEIE reader - PE interrupt enable This bit is set and cleared by software.
Field PEIE writer - PE interrupt enable This bit is set and cleared by software.
Field PS reader - Parity selection This bit selects the odd or even parity when the parity generation/detection is enabled (PCE bit set). It is set and cleared by software. The parity is selected after the current byte. This bitfield can only be written when the LPUART is disabled (UEÂ =Â 0).
Field PS writer - Parity selection This bit selects the odd or even parity when the parity generation/detection is enabled (PCE bit set). It is set and cleared by software. The parity is selected after the current byte. This bitfield can only be written when the LPUART is disabled (UEÂ =Â 0).
Field RE reader - Receiver enable This bit enables the receiver. It is set and cleared by software.
Field RE writer - Receiver enable This bit enables the receiver. It is set and cleared by software.
Field RXFNEIE reader - RXFIFO not empty interrupt enable This bit is set and cleared by software.
Field RXFNEIE writer - RXFIFO not empty interrupt enable This bit is set and cleared by software.
Field TCIE reader - Transmission complete interrupt enable This bit is set and cleared by software.
Field TCIE writer - Transmission complete interrupt enable This bit is set and cleared by software.
Field TE reader - Transmitter enable This bit enables the transmitter. It is set and cleared by software. Note: During transmission, a low pulse on the TE bit (â0â followed by â1â) sends a preamble (idle line) after the current word. In order to generate an idle character, the TE must not be immediately written to 1. In order to ensure the required duration, the software can poll the TEACK bit in the LPUART_ISR register. When TE is set there is a 1 bit-time delay before the transmission starts.
Field TE writer - Transmitter enable This bit enables the transmitter. It is set and cleared by software. Note: During transmission, a low pulse on the TE bit (â0â followed by â1â) sends a preamble (idle line) after the current word. In order to generate an idle character, the TE must not be immediately written to 1. In order to ensure the required duration, the software can poll the TEACK bit in the LPUART_ISR register. When TE is set there is a 1 bit-time delay before the transmission starts.
Field TXFNFIE reader - TXFIFO not full interrupt enable This bit is set and cleared by software.
Field TXFNFIE writer - TXFIFO not full interrupt enable This bit is set and cleared by software.
Field UESM reader - LPUART enable in Stop mode When this bit is cleared, the LPUART is not able to wake up the MCU from low-power mode. When this bit is set, the LPUART is able to wake up the MCU from low-power mode, provided that the LPUART clock selection is HSI or LSE in the RCC. This bit is set and cleared by software. Note: It is recommended to set the UESM bit just before entering low-power mode and clear it on exit from low-power mode.
Field UESM writer - LPUART enable in Stop mode When this bit is cleared, the LPUART is not able to wake up the MCU from low-power mode. When this bit is set, the LPUART is able to wake up the MCU from low-power mode, provided that the LPUART clock selection is HSI or LSE in the RCC. This bit is set and cleared by software. Note: It is recommended to set the UESM bit just before entering low-power mode and clear it on exit from low-power mode.
Field UE reader - LPUART enable When this bit is cleared, the LPUART prescalers and outputs are stopped immediately, and current operations are discarded. The configuration of the LPUART is kept, but all the status flags, in the LPUART_ISR are reset. This bit is set and cleared by software. Note: To enter low-power mode without generating errors on the line, the TE bit must be reset before and the software must wait for the TC bit in the LPUART_ISR to be set before resetting the UE bit. The DMA requests are also reset when UE = 0 so the DMA channel must be disabled before resetting the UE bit.
Field UE writer - LPUART enable When this bit is cleared, the LPUART prescalers and outputs are stopped immediately, and current operations are discarded. The configuration of the LPUART is kept, but all the status flags, in the LPUART_ISR are reset. This bit is set and cleared by software. Note: To enter low-power mode without generating errors on the line, the TE bit must be reset before and the software must wait for the TC bit in the LPUART_ISR to be set before resetting the UE bit. The DMA requests are also reset when UE = 0 so the DMA channel must be disabled before resetting the UE bit.
Field WAKE reader - Receiver wakeup method This bit determines the LPUART wakeup method from Mute mode. It is set or cleared by software. This bitfield can only be written when the LPUART is disabled (UEÂ =Â 0).
Field WAKE writer - Receiver wakeup method This bit determines the LPUART wakeup method from Mute mode. It is set or cleared by software. This bitfield can only be written when the LPUART is disabled (UEÂ =Â 0).