ATTINY15 ATMEL [ATMEL Corporation], ATTINY15 Datasheet - Page 14

• Manufacturer Part Number: ATTINY15
• Manufacturer: ATMEL [ATMEL Corporation]

14
ATtiny15L
Table 4. Reset Characteristics (V
Note:
Table 5. Reset Delay Selections
Notes:
Table 5 shows the start-up times from Reset. When the CPU wakes up from Power-
down, 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 Watchdog Oscilla-
tor 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 on page 64. The device is shipped with CKSEL = “00”.
Symbol
BODEN
V
V
V
POT
RST
BOT
1
0
x
x
x
1. The Power-on Reset will not work unless the supply voltage has been below V
1. On power-up, the start-up time is increased with typical 0.6 ms.
2. “0” means programmed, “1” means unprogrammed.
(2)
(falling).
Parameter
Power-on Reset Threshold
Voltage (rising)
Power-on Reset Threshold
Voltage (falling)
RESET Pin Threshold
Voltage
Brown-out Reset Threshold
Voltage
CKSEL
[1:0]
00
01
10
11
11
(2)
256 ms + 18 CK
256 ms + 18 CK
18 CK + 128 µs
Start-up Time,
16 ms + 18 CK
18 CK + 32 µs
(1)
V
CC
t
TOUT
= 2.7V
at
(1)
CC
= 5.0V)
(BODLEVEL = 1)
(BODLEVEL = 0)
Start-up Time,
64 ms + 18 CK
64 ms + 18 CK
BOD disabled
BOD disabled
BOD enabled
BOD enabled
18 CK + 32 µs
4 ms + 18 CK
18 CK + 8 µs
Condition
V
CC
t
(1)
TOUT
= 5.0V
at
Recommended Usage
BOD disabled, slowly rising
power
BOD disabled, slowly rising
power
BOD disabled, quickly rising
power
BOD disabled
BOD enabled
Min
1.0
1.7
0.4
1.7
2.6
3.8
–
Typ
1.4
2.2
0.6
2.2
2.7
4.0
–
0.85 V
Max
1.8
2.7
0.8
2.7
2.8
4.2
CC
1187D–12/01
Units
V
V
V
V
V
V
V
POT