block/USART1:
  description: Universal synchronous asynchronous receiver transmitter.
  items:
  - name: SR
    description: Status register.
    byte_offset: 0
    bit_size: 16
    fieldset: SR
  - name: DR
    description: Data register.
    byte_offset: 4
    bit_size: 16
    fieldset: DR
  - name: BRR
    description: Baud rate register.
    byte_offset: 8
    bit_size: 16
    fieldset: BRR
  - name: CR1
    description: Control register 1.
    byte_offset: 12
    bit_size: 16
    fieldset: CR1
  - name: CR2
    description: Control register 2.
    byte_offset: 16
    bit_size: 16
    fieldset: CR2
  - name: CR3
    description: Control register 3.
    byte_offset: 20
    bit_size: 16
    fieldset: CR3
  - name: GTPR
    description: Guard time and prescaler register.
    byte_offset: 24
    bit_size: 16
    fieldset: GTPR
fieldset/BRR:
  description: Baud rate register.
  bit_size: 16
  fields:
  - name: DIV_Fraction
    description: fraction of USARTDIV.
    bit_offset: 0
    bit_size: 4
  - name: DIV_Mantissa
    description: mantissa of USARTDIV.
    bit_offset: 4
    bit_size: 12
fieldset/CR1:
  description: Control register 1.
  bit_size: 16
  fields:
  - name: SBK
    description: Send break.
    bit_offset: 0
    bit_size: 1
    enum: SBK
  - name: RWU
    description: Receiver wakeup.
    bit_offset: 1
    bit_size: 1
    enum: RWU
  - name: RE
    description: Receiver enable.
    bit_offset: 2
    bit_size: 1
    enum: RE
  - name: TE
    description: Transmitter enable.
    bit_offset: 3
    bit_size: 1
    enum: TE
  - name: IDLEIE
    description: IDLE interrupt enable.
    bit_offset: 4
    bit_size: 1
    enum: IDLEIE
  - name: RXNEIE
    description: RXNE interrupt enable.
    bit_offset: 5
    bit_size: 1
    enum: RXNEIE
  - name: TCIE
    description: Transmission complete interrupt enable.
    bit_offset: 6
    bit_size: 1
    enum: TCIE
  - name: TXEIE
    description: TXE interrupt enable.
    bit_offset: 7
    bit_size: 1
    enum: TXEIE
  - name: PEIE
    description: PE interrupt enable.
    bit_offset: 8
    bit_size: 1
    enum: PEIE
  - name: PS
    description: Parity selection.
    bit_offset: 9
    bit_size: 1
    enum: PS
  - name: PCE
    description: Parity control enable.
    bit_offset: 10
    bit_size: 1
    enum: PCE
  - name: WAKE
    description: Wakeup method.
    bit_offset: 11
    bit_size: 1
    enum: WAKE
  - name: M
    description: Word length.
    bit_offset: 12
    bit_size: 1
    enum: M
  - name: UE
    description: USART enable.
    bit_offset: 13
    bit_size: 1
    enum: UE
fieldset/CR2:
  description: Control register 2.
  bit_size: 16
  fields:
  - name: ADD
    description: Address of the USART node.
    bit_offset: 0
    bit_size: 4
  - name: LBDL
    description: lin break detection length.
    bit_offset: 5
    bit_size: 1
    enum: LBDL
  - name: LBDIE
    description: LIN break detection interrupt enable.
    bit_offset: 6
    bit_size: 1
    enum: LBDIE
  - name: LBCL
    description: Last bit clock pulse.
    bit_offset: 8
    bit_size: 1
    enum: LBCL
  - name: CPHA
    description: Clock phase.
    bit_offset: 9
    bit_size: 1
    enum: CPHA
  - name: CPOL
    description: Clock polarity.
    bit_offset: 10
    bit_size: 1
    enum: CPOL
  - name: CLKEN
    description: Clock enable.
    bit_offset: 11
    bit_size: 1
    enum: CLKEN
  - name: STOP
    description: STOP bits.
    bit_offset: 12
    bit_size: 2
    enum: STOP
  - name: LINEN
    description: LIN mode enable.
    bit_offset: 14
    bit_size: 1
    enum: LINEN
fieldset/CR3:
  description: Control register 3.
  bit_size: 16
  fields:
  - name: EIE
    description: Error interrupt enable.
    bit_offset: 0
    bit_size: 1
    enum: EIE
  - name: IREN
    description: IrDA mode enable.
    bit_offset: 1
    bit_size: 1
    enum: IREN
  - name: IRLP
    description: IrDA low-power.
    bit_offset: 2
    bit_size: 1
    enum: IRLP
  - name: HDSEL
    description: Half-duplex selection.
    bit_offset: 3
    bit_size: 1
    enum: HDSEL
  - name: NACK
    description: Smartcard NACK enable.
    bit_offset: 4
    bit_size: 1
    enum: NACK
  - name: SCEN
    description: Smartcard mode enable.
    bit_offset: 5
    bit_size: 1
    enum: SCEN
  - name: DMAR
    description: DMA enable receiver.
    bit_offset: 6
    bit_size: 1
    enum: DMAR
  - name: DMAT
    description: DMA enable transmitter.
    bit_offset: 7
    bit_size: 1
    enum: DMAT
  - name: RTSE
    description: RTS enable.
    bit_offset: 8
    bit_size: 1
    enum: RTSE
  - name: CTSE
    description: CTS enable.
    bit_offset: 9
    bit_size: 1
    enum: CTSE
  - name: CTSIE
    description: CTS interrupt enable.
    bit_offset: 10
    bit_size: 1
    enum: CTSIE
fieldset/DR:
  description: Data register.
  bit_size: 16
  fields:
  - name: DR
    description: Data value.
    bit_offset: 0
    bit_size: 9
fieldset/GTPR:
  description: Guard time and prescaler register.
  bit_size: 16
  fields:
  - name: PSC
    description: Prescaler value.
    bit_offset: 0
    bit_size: 8
  - name: GT
    description: Guard time value.
    bit_offset: 8
    bit_size: 8
fieldset/SR:
  description: Status register.
  bit_size: 16
  fields:
  - name: PE
    description: Parity error.
    bit_offset: 0
    bit_size: 1
    enum: PE
  - name: FE
    description: Framing error.
    bit_offset: 1
    bit_size: 1
    enum: FE
  - name: NE
    description: Noise error flag.
    bit_offset: 2
    bit_size: 1
    enum: NE
  - name: ORE
    description: Overrun error.
    bit_offset: 3
    bit_size: 1
    enum: ORE
  - name: IDLE
    description: IDLE line detected.
    bit_offset: 4
    bit_size: 1
    enum: IDLE
  - name: RXNE
    description: Read data register not empty.
    bit_offset: 5
    bit_size: 1
    enum: RXNE
  - name: TC
    description: Transmission complete.
    bit_offset: 6
    bit_size: 1
    enum: TC
  - name: TXE
    description: Transmit data register empty.
    bit_offset: 7
    bit_size: 1
    enum: TXE
  - name: LBD
    description: LIN break detection flag.
    bit_offset: 8
    bit_size: 1
    enum: LBD
  - name: CTS
    description: CTS flag.
    bit_offset: 9
    bit_size: 1
    enum: CTS
enum/CLKEN:
  bit_size: 1
  variants:
  - name: Disabled
    description: CK pin disabled.
    value: 0
  - name: Enabled
    description: CK pin enabled.
    value: 1
enum/CPHA:
  bit_size: 1
  variants:
  - name: First
    description: The first clock transition is the first data capture edge.
    value: 0
  - name: Second
    description: The second clock transition is the first data capture edge.
    value: 1
enum/CPOL:
  bit_size: 1
  variants:
  - name: Low
    description: Steady low value on CK pin outside transmission window.
    value: 0
  - name: High
    description: Steady high value on CK pin outside transmission window.
    value: 1
enum/CTS:
  bit_size: 1
  variants:
  - name: R_NotChanged_W_Clear
    description: No change occurred on the CTS status line.
    value: 0
  - name: Changed
    description: A change occurred on the CTS status line.
    value: 1
enum/CTSE:
  bit_size: 1
  variants:
  - name: Disabled
    description: CTS hardware flow control disabled.
    value: 0
  - name: Enabled
    description: CTS hardware flow control enabled.
    value: 1
enum/CTSIE:
  bit_size: 1
  variants:
  - name: Disabled
    description: CTS interrupt disabled.
    value: 0
  - name: Enabled
    description: CTS interrupt enabled.
    value: 1
enum/DMAR:
  bit_size: 1
  variants:
  - name: Disabled
    description: DMA mode is disabled for reception.
    value: 0
  - name: Enabled
    description: DMA mode is enabled for reception.
    value: 1
enum/DMAT:
  bit_size: 1
  variants:
  - name: Disabled
    description: DMA mode is disabled for transmission.
    value: 0
  - name: Enabled
    description: DMA mode is enabled for transmission.
    value: 1
enum/EIE:
  bit_size: 1
  variants:
  - name: Disabled
    description: Error interrupt disabled.
    value: 0
  - name: Enabled
    description: Error interrupt enabled.
    value: 1
enum/FE:
  bit_size: 1
  variants:
  - name: NoError
    description: No Framing error is detected.
    value: 0
  - name: Error
    description: Framing error or break character is detected.
    value: 1
enum/HDSEL:
  bit_size: 1
  variants:
  - name: FullDuplex
    description: Half duplex mode is not selected.
    value: 0
  - name: HalfDuplex
    description: Half duplex mode is selected.
    value: 1
enum/IDLE:
  bit_size: 1
  variants:
  - name: NoIdle
    description: No Idle Line is detected.
    value: 0
  - name: Idle
    description: Idle Line is detected.
    value: 1
enum/IDLEIE:
  bit_size: 1
  variants:
  - name: Disabled
    description: IDLE interrupt disabled.
    value: 0
  - name: Enabled
    description: IDLE interrupt enabled.
    value: 1
enum/IREN:
  bit_size: 1
  variants:
  - name: Disabled
    description: IrDA disabled.
    value: 0
  - name: Enabled
    description: IrDA enabled.
    value: 1
enum/IRLP:
  bit_size: 1
  variants:
  - name: Normal
    description: Normal mode.
    value: 0
  - name: LowPower
    description: Low-power mode.
    value: 1
enum/LBCL:
  bit_size: 1
  variants:
  - name: Disabled
    description: The clock pulse of the last data bit is not output to the CK pin.
    value: 0
  - name: Enabled
    description: The clock pulse of the last data bit is output to the CK pin.
    value: 1
enum/LBD:
  bit_size: 1
  variants:
  - name: R_NotDetected_W_Clear
    description: LIN break not detected.
    value: 0
  - name: Detected
    description: LIN break detected.
    value: 1
enum/LBDIE:
  bit_size: 1
  variants:
  - name: Disabled
    description: LIN break detection interrupt disabled.
    value: 0
  - name: Enabled
    description: LIN break detection interrupt enabled.
    value: 1
enum/LBDL:
  bit_size: 1
  variants:
  - name: LBDL10
    description: 10-bit break detection.
    value: 0
  - name: LBDL11
    description: 11-bit break detection.
    value: 1
enum/LINEN:
  bit_size: 1
  variants:
  - name: Disabled
    description: LIN mode disabled.
    value: 0
  - name: Enabled
    description: LIN mode enabled.
    value: 1
enum/M:
  bit_size: 1
  variants:
  - name: M8
    description: 8 data bits.
    value: 0
  - name: M9
    description: 9 data bits.
    value: 1
enum/NACK:
  bit_size: 1
  variants:
  - name: Disabled
    description: NACK transmission in case of parity error is disabled.
    value: 0
  - name: Enabled
    description: NACK transmission during parity error is enabled.
    value: 1
enum/NE:
  bit_size: 1
  variants:
  - name: NoNoise
    description: No noise is detected.
    value: 0
  - name: Noise
    description: Noise is detected.
    value: 1
enum/ORE:
  bit_size: 1
  variants:
  - name: NoOverrun
    description: No Overrun error.
    value: 0
  - name: Overrun
    description: Overrun error is detected.
    value: 1
enum/PCE:
  bit_size: 1
  variants:
  - name: Disabled
    description: Parity control disabled.
    value: 0
  - name: Enabled
    description: Parity control enabled.
    value: 1
enum/PE:
  bit_size: 1
  variants:
  - name: NoError
    description: No parity error.
    value: 0
  - name: Error
    description: Parity error.
    value: 1
enum/PEIE:
  bit_size: 1
  variants:
  - name: Disabled
    description: PE interrupt disabled.
    value: 0
  - name: Enabled
    description: PE interrupt enabled.
    value: 1
enum/PS:
  bit_size: 1
  variants:
  - name: Even
    description: Even parity.
    value: 0
  - name: Odd
    description: Odd parity.
    value: 1
enum/RE:
  bit_size: 1
  variants:
  - name: Disabled
    description: Receiver disabled.
    value: 0
  - name: Enabled
    description: Receiver enabled.
    value: 1
enum/RTSE:
  bit_size: 1
  variants:
  - name: Disabled
    description: RTS hardware flow control disabled.
    value: 0
  - name: Enabled
    description: RTS hardware flow control enabled.
    value: 1
enum/RWU:
  bit_size: 1
  variants:
  - name: Active
    description: Receiver in active mode.
    value: 0
  - name: Mute
    description: Receiver in mute mode.
    value: 1
enum/RXNE:
  bit_size: 1
  variants:
  - name: R_NoData_W_Clear
    description: Data is not received.
    value: 0
  - name: DataReady
    description: Received data is ready to be read.
    value: 1
enum/RXNEIE:
  bit_size: 1
  variants:
  - name: Disabled
    description: RXNE interrupt disabled.
    value: 0
  - name: Enabled
    description: RXNE interrupt enabled.
    value: 1
enum/SBK:
  bit_size: 1
  variants:
  - name: NoBreak
    description: No break character is transmitted.
    value: 0
  - name: Break
    description: Break character transmitted.
    value: 1
enum/SCEN:
  bit_size: 1
  variants:
  - name: Disabled
    description: Smartcard mode disabled.
    value: 0
  - name: Enabled
    description: Smartcard mode enabled.
    value: 1
enum/STOP:
  bit_size: 2
  variants:
  - name: Stop1
    description: 1 stop bit.
    value: 0
  - name: Stop0p5
    description: 0.5 stop bits.
    value: 1
  - name: Stop2
    description: 2 stop bits.
    value: 2
  - name: Stop1p5
    description: 1.5 stop bits.
    value: 3
enum/TC:
  bit_size: 1
  variants:
  - name: R_TxNotComplete_W_Clear
    description: Transmission is not complete.
    value: 0
  - name: TxComplete
    description: Transmission is complete.
    value: 1
enum/TCIE:
  bit_size: 1
  variants:
  - name: Disabled
    description: TC interrupt disabled.
    value: 0
  - name: Enabled
    description: TC interrupt enabled.
    value: 1
enum/TE:
  bit_size: 1
  variants:
  - name: Disabled
    description: Transmitter disabled.
    value: 0
  - name: Enabled
    description: Transmitter enabled.
    value: 1
enum/TXE:
  bit_size: 1
  variants:
  - name: TxNotEmpty
    description: Data is not transferred to the shift register.
    value: 0
  - name: TxEmpty
    description: Data is transferred to the shift register.
    value: 1
enum/TXEIE:
  bit_size: 1
  variants:
  - name: Disabled
    description: TXE interrupt disabled.
    value: 0
  - name: Enabled
    description: TXE interrupt enabled.
    value: 1
enum/UE:
  bit_size: 1
  variants:
  - name: Disabled
    description: USART prescaler and outputs disabled.
    value: 0
  - name: Enabled
    description: USART enabled.
    value: 1
enum/WAKE:
  bit_size: 1
  variants:
  - name: IdleLine
    description: USART wakeup on idle line.
    value: 0
  - name: AddressMark
    description: USART wakeup on address mark.
    value: 1