block/IWDG:
  description: Independent watchdog
  items:
  - name: KR
    description: Key register
    byte_offset: 0
    fieldset: KR
  - name: PR
    description: Prescaler register
    byte_offset: 4
    fieldset: PR
  - name: RLR
    description: Reload register
    byte_offset: 8
    fieldset: RLR
  - name: SR
    description: Status register
    byte_offset: 12
    fieldset: SR
  - name: WINR
    description: Window register
    byte_offset: 16
    fieldset: WINR
  - name: EWCR
    description: IWDG early wakeup interrupt register.
    byte_offset: 20
    fieldset: EWCR
fieldset/EWCR:
  description: IWDG early wakeup interrupt register.
  fields:
  - name: EWIT
    description: 'Watchdog counter window value These bits are write access protected (see ). They are written by software to define at which position of the IWDCNT down-counter the early wakeup interrupt must be generated. The early interrupt is generated when the IWDCNT is lower or equal to EWIT[11:0] - 1. EWIT[11:0] must be bigger than 1. An interrupt is generated only if EWIE = 1. The EWU bit in the must be reset to be able to change the reload value. Note: Reading this register returns the Early wakeup comparator value and the Interrupt enable bit from the VDD voltage domain. This value may not be up to date/valid if a write operation to this register is ongoing, hence the value read from this register is valid only when the EWU bit in the is reset.'
    bit_offset: 0
    bit_size: 12
  - name: EWIC
    description: Watchdog early interrupt acknowledge The software must write a 1 into this bit in order to acknowledge the early wakeup interrupt and to clear the EWIF flag. Writing 0 has not effect, reading this flag returns a 0.
    bit_offset: 14
    bit_size: 1
  - name: EWIE
    description: Watchdog early interrupt enable Set and reset by software. The EWU bit in the must be reset to be able to change the value of this bit.
    bit_offset: 15
    bit_size: 1
fieldset/KR:
  description: Key register
  fields:
  - name: KEY
    description: Key value (write only, read 0000h)
    bit_offset: 0
    bit_size: 16
    enum: KEY
fieldset/PR:
  description: Prescaler register
  fields:
  - name: PR
    description: Prescaler divider
    bit_offset: 0
    bit_size: 4
    enum: PR
fieldset/RLR:
  description: Reload register
  fields:
  - name: RL
    description: Watchdog counter reload value
    bit_offset: 0
    bit_size: 12
fieldset/SR:
  description: Status register
  fields:
  - name: PVU
    description: Watchdog prescaler value update
    bit_offset: 0
    bit_size: 1
  - name: RVU
    description: Watchdog counter reload value update
    bit_offset: 1
    bit_size: 1
  - name: WVU
    description: Watchdog counter window value update
    bit_offset: 2
    bit_size: 1
  - name: EWU
    description: Watchdog interrupt comparator value update This bit is set by hardware to indicate that an update of the interrupt comparator value (EWIT[11:0]) or an update of the EWIE is ongoing. It is reset by hardware when the update operation is completed in the VDD voltage domain (takes up to three periods of the IWDG kernel clock iwdg_ker_ck). The EWIT[11:0] and EWIE fields can be updated only when EWU bit is reset.
    bit_offset: 3
    bit_size: 1
  - name: EWIF
    description: Watchdog early interrupt flag This bit is set to ‘1’ by hardware in order to indicate that an early interrupt is pending. This bit must be cleared by the software by writing the bit EWIC of IWDG_EWCR register to ‘1’.
    bit_offset: 14
    bit_size: 1
fieldset/WINR:
  description: Window register
  fields:
  - name: WIN
    description: Watchdog counter window value
    bit_offset: 0
    bit_size: 12
enum/KEY:
  bit_size: 16
  variants:
  - name: Enable
    description: Enable access to PR, RLR and WINR registers (0x5555)
    value: 21845
  - name: Reset
    description: Reset the watchdog value (0xAAAA)
    value: 43690
  - name: Start
    description: Start the watchdog (0xCCCC)
    value: 52428
enum/PR:
  bit_size: 4
  variants:
  - name: DivideBy4
    description: Divider /4
    value: 0
  - name: DivideBy8
    description: Divider /8
    value: 1
  - name: DivideBy16
    description: Divider /16
    value: 2
  - name: DivideBy32
    description: Divider /32
    value: 3
  - name: DivideBy64
    description: Divider /64
    value: 4
  - name: DivideBy128
    description: Divider /128
    value: 5
  - name: DivideBy256
    description: Divider /256
    value: 6
  - name: DivideBy512
    description: Divider /512
    value: 7
  - name: DivideBy1024
    description: Divider /1024
    value: 8