ATmega32A Datasheet - Sunrom Technologies

ATmega32AThe WDP2, WDP1, and WDP0 bits determine the Watchdog Timer prescaling when the WatchdogTimer is enabled. The different prescaling values and their corresponding Timeout Periodsare shown in Table 10-1.Table 10-1.WDP2 WDP1 WDP0Watchdog Timer Prescale SelectNumber of WDTOscillator CyclesTypical Time-outat V CC = 3.0VTypical Time-outat V CC = 5.0V0 0 0 16K (16,384) 17.1ms 16.3ms0 0 1 32K (32,768) 34.3ms 32.5ms0 1 0 64K (65,536) 68.5ms 65ms0 1 1 128K (131,072) 0.14s 0.13s1 0 0 256K (262,144) 0.27s 0.26s1 0 1 512K (524,288) 0.55s 0.52s1 1 0 1,024K (1,048,576) 1.1s 1.0s1 1 1 2,048K (2,097,152) 2.2s 2.1sThe following code example shows one assembly and one C function for turning off the WDT.The example assumes that interrupts are controlled (for example by disabling interrupts globally)so that no interrupts will occur during execution of these functions.Assembly Code ExampleWDT_off:; reset WDTwdr; Write logical one to WDTOE and WDEin r16, WDTCRori r16, (1