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AT90CAN128 Datasheet(PDF) 55 Page - ATMEL Corporation

Part # AT90CAN128
Description  8-bit Microcontroller with 32K/64K/128K Bytes of ISP Flash and CAN Controller
PDF  431 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90CAN128 Datasheet(HTML) 55 Page - ATMEL Corporation

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55
7682C–AUTO–04/08
AT90CAN32/64/128
When the BOD is enabled, and VCC decreases to a value below the trigger level (VBOT- in Figure
7-5), the Brown-out Reset is immediately activated. When VCC increases above the trigger level
(VBOT+ in Figure 7-5), the delay counter starts the MCU after the Time-out period tTOUT has
expired.
The BOD circuit will only detect a drop in VCC if the voltage stays below the trigger level for
longer than tBOD given in Table 7-1.
Figure 7-5.
Brown-out Reset During Operation
7.1.6
Watchdog Reset
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 tTOUT. Refer to
page 57 for details on operation of the Watchdog Timer.
Figure 7-6.
Watchdog Reset During Operation
7.1.7
MCU Status Register – MCUSR
The MCU Status Register provides information on which reset source caused an MCU reset.
VCC
RESET
TIME-OUT
INTERNAL
RESET
VBOT-
VBOT+
tTOUT
CK
CC
Bit
7
6
5
4
3
2
1
0
–
–
–
JTRF
WDRF
BORF
EXTRF
PORF
MCUSR
Read/Write
R
R
R
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0
0
See Bit Description



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