NXP Semiconductors LPC24XX UM10237 - Manual (Page 666)

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User manual Rev. 04 — 26 August 2009 666 of 792
NXP Semiconductors
UM10237
Chapter 27: LPC24XX WatchDog Timer (WDT)
5. Block diagram
The block diagram of the Watchdog is shown below in the Figure 27–137 . The
synchronization logic (PCLK - WDCLK) is not shown in the block diagram.
Fig 137. Watchdog block diagram
WDTC
32 BIT DOWN COUNTER
WDINT WDTOF WDRESET WDEN
SHADOW BIT
reset
interrupt
÷ 4
WDFEED
WDCLKSEL
RTC oscillator
pclk
internal RC oscillator
feed ok
feed error
wdclk
underflow enable
count
WMOD register
feed sequence