M30622MA-XXXFP RENESAS [Renesas Technology Corp], M30622MA-XXXFP Datasheet - Page 443

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M30622MA-XXXFP

Manufacturer Part Number
M30622MA-XXXFP
Description
16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
428
Watchdog Timer
Operation
Figure 2.11.3. Operation timing of watchdog timer
2.11.2 Operation of Watchdog Timer
The following is an operation of the watchdog timer. Figure 2.11.3 shows the operation timing, and Figure
2.11.4 shows the set-up procedure.
Write signal to the
watchdog timer
start register
(1) Writing to the watchdog timer start register initializes the watchdog timer to 7FFF
(2) With a count in progress, writing to the watchdog timer start register again initializes the
(3) Either executing the WAIT instruction or going to the stopped state causes the watchdog
(4) If the watchdog timer underflows, it is initialized to 7FFF
7FFF
causes it to start a down count.
watchdog timer to 7FFF
timer to hold the count in progress and to stop counting. The watchdog timer resumes count-
ing after returning from the execution of the WAIT instruction or from the stopped state.
time, a watchdog timer interrupt occurs.
0000
“H”
“L”
16
16
(1) Start count
16
and causes it to resume counting.
(2) Write operation
(3) In stopped state, or WAIT
instruction is executing, etc
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
16
and continues counting. At this
(4) Generate
Mitsubishi microcomputers
M16C / 62 Group
watchdog timer
interrupt
16
and

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