ATmega88PA Automotive Atmel Corporation, ATmega88PA Automotive Datasheet - Page 48

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

Figure 11-1. Reset Logic
11.3
48
Power-on Reset
BODLEVEL [2..0]
RSTDISBL
Atmel ATmega48PA/88PA/168PA [Preliminary]
Pull-up Resistor
FILTER
SPIKE
A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection
level is defined in
whenever V
Reset, as well as to detect a failure in supply voltage.
A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reaching the
Power-on Reset threshold voltage invokes the delay counter, which determines how long the
device is kept in RESET after V
delay, when V
CC
CC
is below the detection level. The POR circuit can be used to trigger the start-up
CKSEL[3:0]
Power-on Reset
decreases below the detection level.
Reset Circuit
SUT[1:0]
Brown-out
Watchdog
Oscillator
Generator
“System and Reset Characteristics” on page
Circuit
Clock
CK
CC
Register (MCUSR)
rise. The RESET signal is activated again, without any
MCU Status
DATA BUS
Delay Counters
TIMEOUT
318. The POR is activated
9223B–AVR–09/11