Datasheet
ATmega48/88/168 Automotive [DATASHEET]
7530K–AVR–07/14
40
Figure 8-2. MCU Start-up, RESET Tied to V
CC
Figure 8-3. MCU Start-up, RESET Extended Externally
Table 8-1. Power On Reset Specifications
Parameter Symbol Min Typ Max Unit
Power-on reset threshold voltage (rising)
V
POT
1.1 1.4 1.7 V
Power-on reset threshold voltage (falling)
(1)
0.8 1.3 1.6 V
VCC max. start voltage to ensure internal power-on reset
signal
V
PORMAX
0.4 V
VCC min. start voltage to ensure internal power-on reset
signal
V
PORMIN
–0.1 V
VCC rise rate to ensure power-on reset V
CCRR
0.01 V/ms
RESET pin threshold voltage V
RST
0.1V
CC
0.9V
CC
V
Minimum pulse width on RESET pin t
RST
2.5 µs
Note: 1. Before rising, the supply has to be between VPORMIN and VPORMAX to ensure a Reset.
V
CC
V
CCRR
RESET
INTERNAL
RESET
TIME-OUT
t
TOUT
V
PORMAX
V
PORMIN
V
RST
V
DD
RESET
INTERNAL
RESET
TIME-OUT
V
RST
t
TOUT