M0564LE4AE Datasheet, PDF (131/161 Pages) List of Unclassifed Manufacturers – 32-BIT MICROCONTROLLER

M0564
6.23 Watchdog Timer (WDT)
6.23.1 Overview
The Watchdog Timer (WDT) is used to perform a system reset when system runs into an
unknown state. This prevents system from hanging for an infinite period of time. Besides, the
Watchdog Timer supports the function to wake up system from Idle/Power-down mode.
6.23.2 Features
 Supports 18-bit free running up counter
 Selectable time-out interval (2⁴ ~ 2¹⁸) and the time-out interval is 1.6 ms ~ 26.214s if
WDT_CLK is 10 kHzSupports selectable WDT reset delay period between WDT time-out
event to WDT reset system event, and it includes 1026、130、18 or 3 * WDT_CLK delay
period
 System kept in reset state about 63 * WDT_CLK period time after system reset event
occurred
 Supports to force WDT function enabled after chip powered on or reset by setting
CWDTEN[2:0] in Config0 register
 Supports WDT time-out wake-up function only if WDT clock source is selected as LIRC or
LXT
6.23.3 Clock Control
The WDT clock control is shown in Figure 6.23-1.
WDTSEL (CLK_CLKSEL1[1:0])
32.768 kHz (LXT) ₀₁
HCLK/2048 ₁₀
10 kHz (LIRC) ₁₁
WDTCKEN (CLK_APBCLK0[0])
WDT_CLK
Figure 6.23-1 Watchdog Timer Clock Control
May 05, 2017
Page 131 of 161
Rev 1.00