attiny167-esxz ATMEL Corporation, attiny167-esxz Datasheet - Page 48

• Manufacturer Part Number: attiny167-esxz
• Description: 8-bit Avr 8-bit Microcontroller Microcontroller With 16k Bytes In-system Programmable Flash And Lin Controller
• Manufacturer: ATMEL Corporation

6.1.3
48
ATtiny167
Power-on Reset
Figure 6-1.
A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level
is defined in
level. The POR circuit can be used to trigger the start-up 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 Vcc rise. The RESET signal is activated again, without any delay,
when Vcc decreases below the detection level.
Figure 6-2.
INTERNAL
TIME-OUT
BODLEVEL [2..0]
RESET
V
RSTDISBL
CC
Table 22-4 on page
Reset Circuit
MCU Start-up, RESET Tied to Vcc
Pull-up Resistor
Spike
Filter
V
CCRR
V
236. The POR is activated whenever Vcc is below the detection
PORMIN
V
POT
CKSEL[3:0]
V
Power-on Reset
Reset Circuit
SUT[1:0]
PORMAX
Brown-out
Watchdog
Oscillator
Generator
t
TOUT
Circuit
Clock
CK
Register (MCUSR)
MCU Status
DATA BUS
Delay Counters
TIMEOUT
7728A–AUTO–07/08