attiny167-esxz ATMEL Corporation, attiny167-esxz Datasheet - Page 50

• 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

6.1.6
6.1.7
50
ATtiny167
Watchdog System Reset
MCU Status Register – MCUSR
Figure 6-5.
When the Watchdog times out, it will generate a short reset pulse of one CK cycle duration. On
the falling edge of this pulse, the delay timer starts counting the Time-out period t
page 51
Figure 6-6.
The MCU Status Register provides information on which reset source caused an MCU reset.
• Bit 7..4 – Res: Reserved Bits
These bits are unused bits in the ATtiny167, and will always read as zero.
• Bit 3 – WDRF: Watchdog System Reset Flag
This bit is set if a Watchdog System Reset occurs. The bit is reset by a Power-on Reset, or by
writing a logic zero to the flag.
• Bit 2 – BORF: Brown-out Reset Flag
This bit is set if a Brown-out Reset occurs. The bit is reset by a Power-on Reset, or by writing a
logic zero to the flag.
Bit
Read/Write
Initial Value
for details on operation of the Watchdog Timer.
CC
Brown-out Reset During Operation
Watchdog System Reset During Operation
INTERNAL
TIME-OUT
R
7
–
0
RESET
RESET
V
CC
R
6
–
0
R
5
–
0
V
CK
BOT-
R
4
–
0
WDRF
R/W
3
V
t
BORF
See Bit Description
TOUT
R/W
BOT+
2
EXTRF
R/W
1
PORF
R/W
7728A–AUTO–07/08
0
TOUT
. Refer to
MCUSR