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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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ATmega162 Datenblatt(PDF) 53 Page - ATMEL Corporation |
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ATmega162 Datenblatt(HTML) 53 Page - ATMEL Corporation |
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53 / 324 page  53 2513K–AVR–07/09 ATmega162/V WDT in any of the safety levels. Refer to “Timed Sequences for Changing the Configuration of the Watchdog Timer” on page 56 for details. Figure 27. Watchdog Timer Watchdog Timer Control Register – WDTCR • Bits 7..5 – Res: Reserved Bits These bits are reserved bits in the ATmega162 and will always read as zero. • Bit 4 – WDCE: Watchdog Change Enable This bit must be set when the WDE bit is written to logic zero. Otherwise, the Watchdog will not be disabled. Once written to one, hardware will clear this bit after four clock cycles. Refer to the description of the WDE bit for a Watchdog disable procedure. In Safety Levels 1 and 2, this bit must also be set when changing the prescaler bits. See “Timed Sequences for Changing the Configuration of the Watchdog Timer” on page 56. • Bit 3 – WDE: Watchdog Enable When the WDE is written to logic one, the Watchdog Timer is enabled, and if the WDE is written to logic zero, the Watchdog Timer function is disabled. WDE can only be cleared if the WDCE bit has logic level one. To disable an enabled Watchdog Timer, the following procedure must be followed: Table 22. WDT Configuration as a Function of the Fuse Settings of M161C and WDTON. M161C WDTON Safety Level WDT Initial State How to Disable the WDT How to Change Time- out Unprogrammed Unprogrammed 1 Disabled Timed sequence Timed sequence Unprogrammed Programmed 2 Enabled Always enabled Timed sequence Programmed Unprogrammed 0 Disabled Timed sequence No restriction Programmed Programmed 2 Enabled Always enabled Timed sequence WATCHDOG OSCILLATOR Bit 765 4321 0 – – – WDCE WDE WDP2 WDP1 WDP0 WDTCR Read/Write R R R R/W R/W R/W R/W R/W Initial Value 000 0000 0 |
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