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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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ATMEGA128 Arkusz danych(PDF) 23 Page - ATMEL Corporation |
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ATMEGA128 Arkusz danych(HTML) 23 Page - ATMEL Corporation |
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23 / 31 page  23 ATmega128 2467OS–AVR–10/06 ATmega128 Rev. G • First Analog Comparator conversion may be delayed • Interrupts may be lost when writing the timer registers in the asynchronous timer • Stabilizing time needed when changing XDIV Register • Stabilizing time needed when changing OSCCAL Register • IDCODE masks data from TDI input 1. First Analog Comparator conversion may be delayed If the device is powered by a slow rising V CC, the first Analog Comparator conver- sion will take longer than expected on some devices. Problem Fix/Workaround When the device has been powered or reset, disable then enable theAnalog Com- parator before the first conversion. 2. Interrupts may be lost when writing the timer registers in the asynchronous timer If one of the timer registers which is synchronized to the asynchronous timer2 clock is written in the cycle before a overflow interrupt occurs, the interrupt may be lost. Problem Fix/Workaround Always check that the Timer2 Timer/Counter register, TCNT2, does not have the value 0xFF before writing the Timer2 Control Register, TCCR2, or Output Compare Register, OCR2 3. Stabilizing time needed when changing XDIV Register After increasing the source clock frequency more than 2% with settings in the XDIV register, the device may execute some of the subsequent instructions incorrectly. Problem Fix / Workaround The NOP instruction will always be executed correctly also right after a frequency change. Thus, the next 8 instructions after the change should be NOP instructions. To ensure this, follow this procedure: 1.Clear the I bit in the SREG Register. 2.Set the new pre-scaling factor in XDIV register. 3.Execute 8 NOP instructions 4.Set the I bit in SREG This will ensure that all subsequent instructions will execute correctly. Assembly Code Example: CLI ; clear global interrupt enable OUT XDIV, temp ; set new prescale value NOP ; no operation NOP ; no operation NOP ; no operation NOP ; no operation NOP ; no operation NOP ; no operation NOP ; no operation NOP ; no operation SEI ; set global interrupt enable |
Podobny numer części - ATMEGA128_06 |
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Podobny opis - ATMEGA128_06 |
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