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ATmega32A датащи(PDF) 44 Page - ATMEL Corporation

номер детали ATmega32A
подробное описание детали  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
PDF  352 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega32A датащи(HTML) 44 Page - ATMEL Corporation

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8155B–AVR–07/09
ATmega32A
The WDP2, WDP1, and WDP0 bits determine the Watchdog Timer prescaling when the Watch-
dog Timer is enabled. The different prescaling values and their corresponding Timeout Periods
are shown in Table 10-1.
The following code example shows one assembly and one C function for turning off the WDT.
The example assumes that interrupts are controlled (for example by disabling interrupts globally)
so that no interrupts will occur during execution of these functions.
Table 10-1.
Watchdog Timer Prescale Select
WDP2
WDP1
WDP0
Number of WDT
Oscillator Cycles
Typical Time-out
at V
CC = 3.0V
Typical Time-out
at V
CC = 5.0V
0
0
0
16K (16,384)
17.1 ms
16.3 ms
0
0
1
32K (32,768)
34.3 ms
32.5 ms
0
1
0
64K (65,536)
68.5 ms
65 ms
0
1
1
128K (131,072)
0.14 s
0.13 s
1
0
0
256K (262,144)
0.27 s
0.26 s
1
0
1
512K (524,288)
0.55 s
0.52 s
1
1
0
1,024K (1,048,576)
1.1 s
1.0 s
1
1
1
2,048K (2,097,152)
2.2 s
2.1 s
Assembly Code Example
WDT_off:
; reset WDT
wdr
; Write logical one to WDTOE and WDE
in
r16, WDTCR
ori
r16, (1<<WDTOE)|(1<<WDE)
out
WDTCR, r16
; Turn off WDT
ldi
r16, (0<<WDE)
out
WDTCR, r16
ret
C Code Example
void
WDT_off(void)
{
/* reset WDT */
_WDR();
/* Write logical one to WDTOE and WDE */
WDTCR |= (1<<WDTOE) | (1<<WDE);
/* Turn off WDT */
WDTCR = 0x00;
}



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