BL602/604 Reference Manual
BL_WDT
APB
CSR
wdt_irq
watch-dog timer
fclk
clk_mux
clk_div
wdt_cnt
xtal_
f32k_
clk
clk
Figure 13.2: Watchdog timer block diagram
13.2 Main features
• Multiple clock sources, up to 160M clock
• 8-bit clock divider with a division factor of 1-256.
• Two 32-bit timers
• Each timer contains three alarm value settings, which can be set independently to alarm when each alarm value
overflows
• Support Free Run mode and Pre_load mode
• 16-bit watchdog timer
• Supports write password protection to prevent system abnormalities caused by incorrect settings
• Support two watchdog overflow methods: interrupt or reset
13.3 Function description
13.3.1 8-bit divider
There are three types of Watchdog timer clocks:
• Fclk–System master clock
• 32K–32K clock
• Xtal–External crystal
There are four timer clock sources:
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