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參數(shù)資料
| 型號(hào)： | A42MX16-1CQ100M |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | IC I2C PROG PENTA ULDO 20-MLP |
| 中文描述： | 40MX和42MX FPGA系列 |
| 文件頁(yè)數(shù)： | 95/120頁(yè) |
| 文件大?。?/td> | 854K |
| 代理商： | A42MX16-1CQ100M |
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76
4958B–AUTO–11/10
Atmel ATA6285/ATA6286 [Preliminary]
If the Watchdog is accidentally enabled, for example by a runaway pointer or brown-out condi-
tion, 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 situa-
tion, the application software should always clear the Watchdog System Reset Flag (WDRF)
and the WDE control bit in the initialisation routine, even if the Watchdog is not in use.
The following code example shows one assembly and one C function for changing the time-out
value of the Watchdog Timer. The Watchdog Timer should be reset before any change of the
WDPS bits, since a change in the WDPS bits can result in a time-out when switching to a shorter
time-out period:
Note:
Assembly Code Example(1)
WDT_Prescaler_Change:
; Turn off global interrupt
cli
; Reset Watchdog Timer
wdr
; Start timed sequence
lds r16, WDTCR
ori r16, (1<<WDCE) | (1<<WDE)
sts WDTCR, 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<<WDPS2) | (1<<WDPS0)
sts WDTCR, r16
; -- Finished setting new values, used 2 cycles -
; Turn on global interrupt
sei
C Code Example(1)
void WDT_Prescaler_Change(void)
{
__disable_interrupt();
__watchdog_reset();
/* Start timed equence */
WDTCR |= (1<<WDCE) | (1<<WDE);
/* Set new prescaler(time-out) value = 64K cycles (~0.5 s) */
WDTCR = (1<<WDE) | (1<<WDPS2) | (1<<WDPS0);
__enable_interrupt();
}
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| A42MX16-1PL100 | 40MX and 42MX FPGA Families |
| A42MX16-1PL100A | IC TVS BI-DIR 5V 350W SOD-323 |
| A42MX16-1PL100B | 40MX and 42MX FPGA Families |
| A42MX16-1PL100ES | 40MX and 42MX FPGA Families |
| A42MX16-1PL100I | 40MX and 42MX FPGA Families |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| A42MX16-1PL100 | 制造商:ACTEL 制造商全稱:Actel Corporation 功能描述:40MX and 42MX FPGA Families |
| A42MX16-1PL100A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:40MX and 42MX FPGA Families |
| A42MX16-1PL100B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:40MX and 42MX FPGA Families |
| A42MX16-1PL100ES | 制造商:ACTEL 制造商全稱:Actel Corporation 功能描述:40MX and 42MX FPGA Families |
| A42MX16-1PL100I | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:40MX and 42MX FPGA Families |
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