R01UH0822EJ0100 Rev.1.00
Page 578 of 1041
Jul 31, 2019
RX13T Group
22. Independent Watchdog Timer (IWDTa)
shows the IWDT refresh-operation waveforms when PCLK > IWDTCLK and clock divide ratio =
IWDTCLK.
Figure 22.6
IWDT Refresh Operation Waveforms (IWDTCR.CKS[3:0] = 0000b, IWDTCR.TOPS[1:0] = 11b)
Invalid
Valid
Refreshing
Peripheral module
clock (PCLK)
IWDT-dedicated
clock (IWDTCLK)
Data written to
IWDTRR register
IWDTRR register write
signal (internal signal)
IWDTRR register
Refresh
synchronization signal
Refresh signal
(after synchronization
with IWDTCLK)
Counter value
n+2
n+1
n
n-1
n-2
n-3
FFh
FFh
00h
00h
Refresh request
00h
54h
00h
FFh
FFh
07FFh