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Chapter 20 Software Watchdog Timer
1.Overview
Chapter 20 Software Watchdog Timer
1. Overview
The software watchdog timer consists of a selector that uses the output from a 26-bit timebase counter using
the base clock (F) and a one-bit counter.
The watchdog timer generates the watchdog reset (initial setting reset) if the generation delay operation (an
interval watchdog reset) is disabled due to problems such as program runaway.
2. Features
■ Watchdog timer
• Type : Generates the watchdog reset (INIT) with the overflow from one-bit counter
• Quantity : 1
• Count clock (interval time): Bit output from the timebase timer
4 types 2
20
/F
F
, 2
22
/F
F
, 2
24
/F
F
, 2
26
/F
F
(Can be set only once after the reset (RST).)
• Clearing 1-bit counter:
Successively writes “A5”“5A” to watchdog reset generation delay register WPR by the software.
• Operation start/stop: This timer starts to operate once it writes data to the watchdog control register RSRR
for the first time after the reset (RST). This timer stops only by the reset (RST).
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Watchdog control section
Base
clock
(f)
26-bit counter
Selector
Counter
Watchdog timer
Timebase timer
Watchdog
reset
Timebase
counter