AT90CAN128-16AE ATMEL Corporation, AT90CAN128-16AE Datasheet - Page 52

• Manufacturer Part Number: AT90CAN128-16AE
• Description: 8-bit Avr Microcontroller With 128K Bytes of Isp Flash And CAN Controller.flash (Kbytes) 128 Vcc (V) 2.7-5.5 EEPROM (Kbytes) 4 SRAM (bytes) 4K CAN (mess. Obj.) 15
• Manufacturer: ATMEL Corporation

Watchdog Reset
MCU Status Register –
MCUSR
52
AT90CAN128
the trigger level (V
out period t
The BOD circuit will only detect a drop in V
for longer than t
Figure 26. Brown-out Reset During Operation
When the Watchdog times out, it will generate a short reset pulse of one CK cycle dura-
tion. On the falling edge of this pulse, the delay timer starts counting the Time-out period
t
Figure 27. Watchdog Reset During Operation
The MCU Status Register provides information on which reset source caused an MCU
reset.
• Bit 7..5 – Reserved Bits
These bits are reserved for future use.
Bit
Read/Write
Initial Value
TOUT
. Refer to page 54 for details on operation of the Watchdog Timer.
CC
INTERNAL
TIME-OUT
TOUT
RESET
RESET
V
CC
BOD
R
has expired.
7
–
0
BOT+
given in Table 19.
in Figure 26), the delay counter starts the MCU after the Time-
R
6
–
0
R
5
–
0
V
CK
BOT-
JTRF
R/W
4
CC
if the voltage stays below the trigger level
WDRF
R/W
3
See Bit Description
BORF
R/W
2
V
t
TOUT
BOT+
EXTRF
R/W
1
PORF
R/W
4250C–CAN–03/04
0
MCUSR