ATmega88PA Automotive Atmel Corporation, ATmega88PA Automotive Datasheet - Page 42

• Manufacturer Part Number: ATmega88PA Automotive
• Manufacturer: Atmel Corporation

9.4
42
External Reset
Atmel ATtiny24/44/84 [Preliminary]
Figure 9-3.
Table 9-1.
Note:
An External Reset is generated by a low level on the RESET pin if enabled. Reset pulses lon-
ger than the minimum pulse width (see
will generate a reset, even if the clock is not running. Shorter pulses are not guaranteed to
generate a reset. When the applied signal reaches the Reset Threshold Voltage – V
its positive edge, the delay counter starts the MCU after the Time-out period – t
expired.
Symbol
V
V
V
V
V
POT
PORMAX
PORMIN
CCRR
RST
INTERNAL
TIME-OUT
RESET
RESET
1. Before rising, the supply has to be between
V
CC
Parameter
Power-on Reset Threshold Voltage (rising)
Power-on Reset Threshold Voltage (falling)
VCC Max. start voltage to ensure internal
Power-on Reset signal
VCC Min. start voltage to ensure internal
Power-on Reset signal
VCC Rise Rate to ensure Power-on Reset
MCU Start-up, RESET Extended Externally
Power On Reset Specifications
RESET Pin Threshold Voltage
V
POT
“System and Reset Characterizations” on page
V
RST
t
TOUT
V
PORMIN
()
and V
0.01
Min
-0.1
V
1.1
0.8
0.1
CC
PORMAX
Typ
1.4
1.3
to ensure a Reset.
0.9V
Max
7701E–AVR–02/11
1.7
1.6
0.4
CC
TOUT
RST
V/ms
– has
Unit
181)
– on
V
V
V
V
V