5.13 IWDG 使用说明

name    IWDG_WriteConfig.
fun     Config write protection of IWDG_PREDIV and IWDG_RELV registers.
param   IWDG_WriteAccess : key value written to IWDG_KEY.KEYV[15:0]
        - IWDG_WRITE_ENABLE (0x5555) : disable the write protection, so
          that IWDG_PREDIV and IWDG_RELV become writable
        - IWDG_WRITE_DISABLE (0x0000) : re-arm the write protection
return  none

name    IWDG_SetPrescalerDiv.
fun     Sets the IWDG prescaler divider ratio (IWDG_PREDIV.PD[2:0]).
param   IWDG_Prescaler : prescaler divider, one of :
          - IWDG_PRESCALER_DIV4   (PD[2:0] = 0b000, divisor 4)
          - IWDG_PRESCALER_DIV8   (PD[2:0] = 0b001, divisor 8)
          - IWDG_PRESCALER_DIV16  (PD[2:0] = 0b010, divisor 16)
          - IWDG_PRESCALER_DIV32  (PD[2:0] = 0b011, divisor 32)
          - IWDG_PRESCALER_DIV64  (PD[2:0] = 0b100, divisor 64)
          - IWDG_PRESCALER_DIV128 (PD[2:0] = 0b101, divisor 128)
          - IWDG_PRESCALER_DIV256 (PD[2:0] = 0b111, divisor 256)
return  none

name    IWDG_CntReload.
fun     Sets IWDG reload value.
param   Reload :
          - 0x000 ~ 0xFFF (REL[11:0]); larger values are truncated by the field mask
return  none

name    IWDG_ReloadKey.
fun     Reload IWDG counter with value defined in IWDG_RELV register.
param   none
return  none

name    IWDG_Enable.
fun     Start watch dog counter.
param   none
return  none

name    IWDG_Freeze_Enable.
fun     Freeze or unfreeze IWDG while IWDG is running in run mode.
param   Cmd : freeze control, written to IWDG_KEY.KEYV[15:0]
          - ENABLE  : 0x4567, stops the IWDG counter in RUN mode
          - DISABLE : 0x89AB, resumes the counter in RUN mode
return  none

name    IWDG_GetStatus.
fun     Checks whether the specified IWDG flag is set or not.
param   IWDG_FLAG : status flag selected in the IWDG_STS register
          - IWDG_PVU_FLAG
          - IWDG_CRVU_FLAG
          - IWDG_FRZF_FLAG
return  FlagStatus :
          - RESET
          - SET