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ATMEGA163 Datasheet(PDF) 25 Page - ATMEL Corporation |
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ATMEGA163 Datasheet(HTML) 25 Page - ATMEL Corporation |
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25 / 187 page  25 ATmega163(L) 1142E–AVR–02/03 Notes: 1. On power-up, the start-up time is increased with typ. 0.6 ms. 2. “1” means unprogrammed, “0” means programmed. 3. For possible clock selections, see “Clock Options” on page 5. 4. When BODEN is programmed, add 100 µs. 5. When BODEN is programmed, add 25 µs. 6. Default value. Table 5 shows the Start-up Times from Reset. When the CPU wakes up from Power- down or Power-save, only the clock counting part of the start-up time is used. The Watchdog Oscillator is used for timing the real time part of the start-up time. The number of WDT Oscillator cycles used for each time-out is shown in Table 6. The frequency of the Watchdog Oscillator is voltage dependent as shown in the Electri- cal Characteristics section. The device is shipped with CKSEL = “0010” (Int. RC Oscillator, slowly rising power). Table 5. Reset Delay Selections (1) CKSEL (2) Start-up Time, VCC = 2.7V, BODLEVEL Unprogrammed Start-up Time, VCC = 4.0V, BODLEVEL Programmed Recommended Usage (3) 0000 4.2 ms + 6 CK 5.8 ms + 6 CK Ext. Clock, fast rising power 0001 30 µs + 6 CK (4) 10 µs + 6 CK (5) Ext. Clock, BOD enabled 0010 (6) 67 ms + 6 CK 92 ms + 6 CK Int. RC Oscillator, slowly rising power 0011 4.2 ms + 6 CK 5.8 ms + 6 CK Int. RC Oscillator, fast rising power 0100 30 µs + 6 CK (4) 10 µs + 6 CK (5) Int. RC Oscillator, BOD enabled 0101 67 ms + 6 CK 92 ms + 6 CK Ext. RC Oscillator, slowly rising power 0110 4.2 ms + 6 CK 5.8 ms + 6 CK Ext. RC Oscillator, fast rising power 0111 30 µs + 6 CK (4) 10 µs + 6 CK (5) Ext. RC Oscillator, BOD enabled 1000 67ms + 32K CK 92 ms + 32K CK Ext. Low-frequency Crystal 1001 67 ms + 1K CK 92 ms + 1K CK Ext. Low-frequency Crystal 1010 67 ms + 16K CK 92 ms + 16K CK Crystal Oscillator, slowly rising power 1011 4.2 ms + 16K CK 5.8 ms + 16K CK Crystal Oscillator, fast rising power 1100 30 µs + 16K CK (4) 10 µs + 16K CK (5) Crystal Oscillator, BOD enabled 1101 67 ms + 1K CK 92 ms + 1K CK Ceramic Resonator/Ext. Clock, slowly rising power 1110 4.2 ms + 1K CK 5.8 ms + 1K CK Ceramic Resonator, fast rising power 1111 30 µs + 1K CK (4) 10 µs + 1K CK (5) Ceramic Resonator, BOD enabled |
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