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參數(shù)資料
| 型號： | AT43USB326-AU |
| 廠商： | Atmel Corp. |
| 英文描述： | Multimedia USB Keyboard Controller with Embedded Hub |
| 中文描述： | 多媒體USB鍵盤控制器的嵌入式集線器 |
| 文件頁數(shù)： | 22/102頁 |
| 文件大?。?/td> | 511K |
| 代理商： | AT43USB326-AU |
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22
AT43USB326
3313D–USB–04/06
External Reset
An external reset is generated by a low-level on the RESET pin. Reset pulses longer than
200 ns will generate a reset. Shorter pulses are not guaranteed to generate a reset. When the
applied signal reaches the Reset Threshold Voltage - V
RST
on its positive edge, the delay timer
starts the MCU after the Time-out period t
TOUT
has expired.
Figure 7.
External Reset During Operation
Watchdog Timer
Reset
When the watchdog times out, it will generate a short reset pulse of 1 XTAL cycle duration. On
the falling edge of this pulse, the delay timer starts counting the Time-out period t
TOUT
.
Figure 8.
Watchdog Reset During Operation
Non-USB Related
Interrupt Handling
The AT43USB326 has two non-USB 8-bit Interrupt Mask control registers; GIMSK (General
Interrupt Mask Register) and TIMSK (Timer/Counter Interrupt Mask Register).
When an interrupt occurs, the Global Interrupt Enable I-bit is cleared (zero) and all interrupts
are disabled. The user software can set (one) the I-bit to enable nested interrupts. The I-bit is
set (one) when a Return from Interrupt instruction, RETI, is executed.
For Interrupts triggered by events that can remain static (e.g. the Output Compare register1
matching the value of Timer/Counter1) the interrupt flag is set when the event occurs. If the
interrupt flag is cleared and the interrupt condition persists, the flag will not be set until the
event occurs the next time.
When the Program Counter is vectored to the actual interrupt vector in order to execute the
interrupt handling routine, hard-ware clears the corresponding flag that generated the inter-
rupt. Some of the interrupt flags can also be cleared by writing a logic one to the flag bit
position(s) to be cleared.
t
TOUT
V
RST
VCC
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
VCC
RESET
WDT
TIME-OUT
RESET
TIME-OUT
1 XTAL Cycle
INTERNAL
RESET
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AT43USB351M | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Missed Watchdog Timer Reset |
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| AT43USB351M-AC | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Full-speed/ Low-speed USB Microcontroller with ADC and PWM |
| AT43USB353M | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Missed Watchdog Timer Reset |
| AT43USB353M_03 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Low Cost USB Microcontroller with Hub, ADC and PWM |
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