參數(shù)資料
型號(hào)： R5F3651KDFC
元件分類： 微控制器/微處理器
英文描述： MICROCONTROLLER, PQFP128
封裝： 20 X 14 MM, 0.50 MM PITCH, LQFP-128
文件頁(yè)數(shù)： 36/81頁(yè)
文件大小： 879K
代理商： R5F3651KDFC
54
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
The following code example shows one assembly and one C function for changing the time-out
value of the Watchdog Timer.
Note:
1. The example code assumes that the part specific header file is included.
Note: The Watchdog Timer should be reset before any change of the WDP bits, since a change
in the WDP bits can result in a time-out when switching to a shorter time-out period;
9.2.1
Watchdog Timer Control Register - WDTCSR
Bit 7 - WDIF: Watchdog Interrupt Flag
This bit is set when a time-out occurs in the Watchdog Timer and the Watchdog Timer is config-
ured for interrupt. WDIF is cleared by hardware when executing the corresponding interrupt
handling vector. Alternatively, WDIF is cleared by writing a logic one to the flag. When the I-bit in
SREG and WDIE are set, the Watchdog Time-out Interrupt is executed.
Assembly Code Example
WDT_Prescaler_Change:
; Turn off global interrupt
cli
; Reset Watchdog Timer
wdr
; Start timed sequence
lds
r16, WDTCSR
ori
r16, (1<<WDCE) | (1<<WDE)
sts
WDTCSR, r16
; --
Got four cycles to set the new values from here -
; Set new prescaler(time-out) value = 64K cycles (~0.5 s)
ldi
r16, (1<<WDE) | (1<<WDP2) | (1<<WDP0)
sts
WDTCSR, r16
; --
Finished setting new values, used 2 cycles -
; Turn on global interrupt
sei
ret
C Code Example
void WDT_Prescaler_Change(void)
{
__disable_interrupt();
__watchdog_reset();
/* Start timed
equence */
WDTCSR |= (1<<WDCE) | (1<<WDE);
/* Set new prescaler(time-out) value = 64K cycles (~0.5 s) */
WDTCSR
= (1<<WDE) | (1<<WDP2) | (1<<WDP0);
__enable_interrupt();
}
Bit
76543210
WDIF
WDIE
WDP3
WDCE
WDE
WDP2
WDP1
WDP0
WDTCSR
Read/Write
R/W
Initial Value
0000
X
000
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