参数资料
型号: M30600M8-XXXGP
元件分类: 微控制器/微处理器
英文描述: 16-BIT, MROM, MICROCONTROLLER, PQFP100
封装: 14 X 14 MM, 0.50 MM PITCH, PLASTIC, LQFP-100
文件页数: 81/139页
文件大小: 1782K
代理商: M30600M8-XXXGP
Mitsubishi microcomputers
M16C / 60 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Watchdog Timer
46
CM07
CM06
CM17
CM16
Internal clock
WDC7
Period
0
10MHz
0
Approx. 52.4ms (Note)
1
Approx. 419.2ms (Note)
0
1
5MHz
0
Approx. 104.9ms (Note)
1
Approx. 838.8ms (Note)
0
1
0
2.5MHz
0
Approx. 209.7ms (Note)
1
Approx. 1.68s (Note)
0
1
0.625MHz
0
Approx. 838.8ms (Note)
1
Approx. 6.71s (Note)
0
1
Invalid
1.25MHz
0
Approx. 419.2ms (Note)
1
Approx. 3.35s (Note)
1
Invalid
32kHz
Invalid
Approx. 2s (Note)
Watchdog Timer
The watchdog timer has the function of detecting when the program is out of control. The watchdog timer is
a 15-bit counter which down-counts the clock derived by dividing the internal clock
using the prescaler.
A watchdog timer interrupt is generated when an underflow occurs in the watchdog timer. When XIN is
selected for the internal clock
, bit 7 of the watchdog timer control register (address 000F16) selects the
prescaler division ratio (by 16 or by 128). When XCIN is selected as the internal clock
, the prescaler is set
for division by 2 regardless of bit 7 of the watchdog timer control register (address 000F16). Table 1.20
shows a periodic table for the watchdog timer.
The watchdog timer is initialized by writing to the watchdog timer start register (address 000E16) and when
a watchdog timer interrupt request is generated. The prescaler is initialized only when the microcomputer is
reset. After a reset is cancelled, the watchdog timer and prescaler are both stopped. The count is started by
writing to the watchdog timer start register (address 000E16).
Figure 1.30 shows a block diagram of the watchdog timer. Figure 1.31 shows the configuration of the
watchdog timer-related registers.
Table 1.20. Watchdog timer periodic table (XIN = 10MHz, XCIN = 32kHz)
Note: Error is generated by the prescaler.
Figure 1.30. Block diagram of watchdog timer
Internal clock
Write to the watchdog
timer start register
(address 000E16)
RESET
Watchdog timer
interrupt request
Watchdog timer
Set to
"7FFF16"
1/128
1/16
"CM07=0"
"WDC7=1"
"CM07=0"
"WDC7=0"
"CM07=1"
HOLD
1/2
Prescaler
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