ATMEGA163 ATMEL [ATMEL Corporation], ATMEGA163 Datasheet - Page 25

• Manufacturer Part Number: ATMEGA163
• Description: 8-bit Microcontroller with 16K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

1142E–AVR–02/03
Table 5. Reset Delay Selections
Notes:
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).
CKSEL
0010
0000
0001
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
(6)
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.
(2)
30 µs + 16K CK
4.2 ms + 16K CK
Unprogrammed
67 ms + 16K CK
30 µs + 1K CK
67ms + 32K CK
4.2 ms + 1K CK
Start-up Time,
67 ms + 1K CK
67 ms + 1K CK
30 µs + 6 CK
30 µs + 6 CK
30 µs + 6 CK
4.2 ms + 6 CK
4.2 ms + 6 CK
4.2 ms + 6 CK
67 ms + 6 CK
67 ms + 6 CK
BODLEVEL
V
CC
= 2.7V,
(4)
(4)
(4)
(4)
(4)
10 µs + 16K CK
(1)
5.8 ms + 16K CK
92 ms + 32K CK
92 ms + 16K CK
10 µs + 1K CK
5.8 ms + 1K CK
Start-up Time,
92 ms + 1K CK
92 ms + 1K CK
10 µs + 6 CK
10 µs + 6 CK
10 µs + 6 CK
5.8 ms + 6 CK
5.8 ms + 6 CK
5.8 ms + 6 CK
Programmed
92 ms + 6 CK
92 ms + 6 CK
BODLEVEL
V
CC
= 4.0V,
(5)
(5)
(5)
(5)
(5)
Recommended Usage
Ext. Clock, fast rising power
Ext. Clock, BOD enabled
Int. RC Oscillator, slowly rising power
Int. RC Oscillator, fast rising power
Int. RC Oscillator, BOD enabled
Ext. RC Oscillator, slowly rising power
Ext. RC Oscillator, fast rising power
Ext. RC Oscillator, BOD enabled
Ext. Low-frequency Crystal
Ext. Low-frequency Crystal
Crystal Oscillator, slowly rising power
Crystal Oscillator, fast rising power
Crystal Oscillator, BOD enabled
Ceramic Resonator/Ext. Clock, slowly
rising power
Ceramic Resonator, fast rising power
Ceramic Resonator, BOD enabled
ATmega163(L)
(3)
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