参数资料
型号: MB9AF314MPMC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, FLASH, 40 MHz, RISC MICROCONTROLLER, PQFP80
封装: 0.50 MM PITCH, PLASTIC, LQFP-80
文件页数: 56/114页
文件大小: 1357K
代理商: MB9AF314MPMC
ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
46
The following code example shows one assembly and one C function for turning off the watchdog timer. The example
assumes that interrupts are controlled (e.g. by disabling interrupts globally) so that no interrupts will occur during the
execution of these functions.
Assembly Code Example(1)
WDT_off:
; Turn off global interrupt
cli
; Reset Watchdog Timer
wdr
; Clear WDRF in MCUSR
in
r16, MCUSR
andi
r16, (0xff & (0<<WDRF))
out
MCUSR, r16
; Write logical one to WDCE and WDE
; Keep old prescaler setting to prevent unintentional time-out
lds
r16, WDTCSR
ori
r16, (1<<WDCE) | (1<<WDE)
sts
WDTCSR, r16
; Turn off WDT
ldi
r16, (0<<WDE)
sts
WDTCSR, r16
; Turn on global interrupt
sei
ret
C Code Example(1)
void WDT_off(void)
{
__disable_interrupt();
__watchdog_reset();
/* Clear WDRF in MCUSR */
MCUSR &= ~(1<<WDRF);
/* Write logical one to WDCE and WDE */
/* Keep old prescaler setting to prevent unintentional time-out */
WDTCSR |= (1<<WDCE) | (1<<WDE);
/* Turn off WDT */
WDTCSR = 0x00;
__enable_interrupt();
}
Notes: 1.
2.
If the watchdog is accidentally enabled, for example by a runaway pointer or brown-out condition, the device
will be reset and the watchdog timer will stay enabled. If the code is not set up to handle the watchdog, this
might lead to an eternal loop of time-out resets. To avoid this situation, the application software should
always clear the watchdog
system reset flag (WDRF) and the WDE control bit in the initialization routine, even if the watchdog is not in
use.
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