following the designed circuit:
interval provided is one sec.
the output of reset pin keeps on pulsating continuously .ie. makes controller reset
is the hardware right ?
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I think the reason your reset pin keeps pulsating continuously is that your WDI pin is causing a watchdog reset to occur. You have WDI pulled up to VDD which is OK but you have to pulse WDI within the watchdog timeout otherwise the RESET pin will reset.
Can you provide oscilloscope captures of VDD, WDI, and /RESET?
Looking at your schematic, VDD is 4.2V. The "high" level for WDI is minimum of 0.8*VDD. This means WDI should be more than 3.36V to be considered "high". If you increase the amplitude of the WDI signal, does this fix the issue?