参数资料
型号: M30201F4T-FP
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 10 MHz, MICROCONTROLLER, PQFP56
封装: PLASTIC, QFP-56
文件页数: 100/158页
文件大小: 1633K
代理商: M30201F4T-FP
46
Under
development
Mitsubishi microcomputers
M30201 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Watchdog Timer
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”
BCLK
1/2
Prescaler
Figure 1.34. Block diagram of watchdog timer
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 BCLK using the prescaler. A watchdog
timer interrupt is generated when an underflow occurs in the watchdog timer. When XIN is selected for the
BCLK, 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 BCLK, the prescaler is set for division by 2 regardless of bit 7
of the watchdog timer control register (address 000F16).
When XIN is selected in BCLK
Watchdog timer cycle =
When XCIN is selected in BCLK
Watchdog timer cycle =
For example, when BCLK is 10MHz and the prescaler division ratio is set to 16, the watchdog timer cycle is
approximately 52.4 ms.
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 1.34 shows the block diagram of the watchdog timer. Figure 1.35 shows the watchdog timer-related
registers.
Prescaler division ratio (16 or 128) x watchdog timer count (32768)
BCLK
Prescaler division ratio (2) x watchdog timer count (32768)
BCLK
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