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| 型號(hào)： | MV80C51C-20D |
| 廠商： | ATMEL CORP |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | 1.40 MM HEIGHT, QFP-44 |
| 文件頁(yè)數(shù)： | 101/170頁(yè) |
| 文件大?。?/td> | 4133K |
| 代理商： | MV80C51C-20D |
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36
ATtiny4/5/9/10 [DATASHEET]
8127F–AVR–02/2013
0x000B
RESET: ldi
r16, high(RAMEND); Main program start
0x000C
out
SPH,r16
; Set Stack Pointer
0x000D
ldi
r16, low(RAMEND) ; to top of RAM
0x000E
out
SPL,r16
0x000F
sei
; Enable interrupts
0x0010
<instr>
...
9.2
External Interrupts
External Interrupts are triggered by the INT0 pin or any of the PCINT3..0 pins. Observe that, if enabled, the inter-
rupts will trigger even if the INT0 or PCINT3..0 pins are configured as outputs. This feature provides a way of
generating a software interrupt. Pin change 0 interrupts PCI0 will trigger if any enabled PCINT3..0 pin toggles. The
PCMSK Register controls which pins contribute to the pin change interrupts. Pin change interrupts on PCINT3..0
are detected asynchronously, which means that these interrupts can be used for waking the part also from sleep
modes other than Idle mode.
The INT0 interrupt can be triggered by a falling or rising edge or a low level. This is set up as shown in “EICRA –
External Interrupt Control Register A” on page 37. When the INT0 interrupt is enabled and configured as level trig-
gered, the interrupt will trigger as long as the pin is held low. Note that recognition of falling or rising edge interrupts
on INT0 requires the presence of an I/O clock, as described in “Clock System” on page 17.
9.2.1
Low Level Interrupt
A low level interrupt on INT0 is detected asynchronously. This means that the interrupt source can be used for
waking the part also from sleep modes other than Idle (the I/O clock is halted in all sleep modes except Idle).
Note that if a level triggered interrupt is used for wake-up from Power-down, the required level must be held long
enough for the MCU to complete the wake-up to trigger the level interrupt. If the level disappears before the end of
the Start-up Time, the MCU will still wake up, but no interrupt will be generated. The start-up time is defined as
described in “Clock System” on page 17.
If the low level on the interrupt pin is removed before the device has woken up then program execution will not be
diverted to the interrupt service routine but continue from the instruction following the SLEEP command.
9.2.2
Pin Change Interrupt Timing
A timing example of a pin change interrupt is shown in Figure 9-1.
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