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ATmega128-16AU Arkusz danych(PDF) 54 Page - ATMEL Corporation |
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ATmega128-16AU Arkusz danych(HTML) 54 Page - ATMEL Corporation |
54 / 386 page 54 2467S–AVR–07/09 ATmega128 Watchdog Reset When the Watchdog times out, it will generate a short reset pulse of 1 CK cycle duration. On the falling edge of this pulse, the delay timer starts counting the Time-out period t TOUT. Refer to page 55 for details on operation of the Watchdog Timer. Figure 27. Watchdog Reset During Operation MCU Control and Status Register – MCUCSR The MCU Control and Status Register provides information on which reset source caused an MCU reset. Note that only EXTRF and PORF are available in ATmega103 compatibility mode. • Bit 4 – JTRF: JTAG Reset Flag This bit is set if a reset is being caused by a logic one in the JTAG Reset Register selected by the JTAG instruction AVR_RESET. This bit is reset by a Power-on Reset, or by writing a logic zero to the flag. • Bit 3 – WDRF: Watchdog Reset Flag This bit is set if a Watchdog Reset occurs. The bit is reset by a Power-on Reset, or by writing a logic zero to the flag. • Bit 2 – BORF: Brown-out Reset Flag This bit is set if a Brown-out Reset occurs. The bit is reset by a Power-on Reset, or by writing a logic zero to the flag. • Bit 1 – EXTRF: External Reset Flag This bit is set if an External Reset occurs. The bit is reset by a Power-on Reset, or by writing a logic zero to the flag. • Bit 0 – PORF: Power-On Reset Flag This bit is set if a Power-on Reset occurs. The bit is reset only by writing a logic zero to the flag. To make use of the reset flags to identify a reset condition, the user should read and then reset the MCUCSR as early as possible in the program. If the register is cleared before another reset occurs, the source of the reset can be found by examining the reset flags. Internal Voltage Reference ATmega128 features an internal bandgap reference. This reference is used for Brown-out Detection, and it can be used as an input to the Analog Comparator or the ADC. The 2.56V ref- erence to the ADC is generated from the internal bandgap reference. CK CC Bit 7 6 54321 0 JTD – – JTRF WDRF BORF EXTRF PORF MCUCSR Read/Write R/W R R R/W R/W R/W R/W R/W Initial Value 0 0 0 See Bit Description |
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