AT90CAN64-16AUR Atmel, AT90CAN64-16AUR Datasheet - Page 57

• Manufacturer Part Number: AT90CAN64-16AUR
• Description: MCU AVR 64K FLASH 16MHZ 64TQFP
• Manufacturer: Atmel
• Series: AVR® 90CANr

Specifications of AT90CAN64-16AUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: CAN, EBI/EMI, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.2.2
7.3
7679H–CAN–08/08
Watchdog Timer
Voltage Reference Characteristics
ADC is used. To reduce power consumption in Power-down mode, the user can avoid the three
conditions above to ensure that the reference is turned off before entering Power-down mode.
Table 7-4.
The Watchdog Timer is clocked from a separate On-chip Oscillator which runs at 1 MHz. This is
the typical value at V
controlling the Watchdog Timer prescaler, the Watchdog Reset interval can be adjusted as
shown in
Timer. The Watchdog Timer is also reset when it is disabled and when a Chip Reset occurs.
Eight different clock cycle periods can be selected to determine the reset period. If the reset
period expires without another Watchdog Reset, the AT90CAN32/64/128 resets and executes
from the Reset Vector. For timing details on the Watchdog Reset, refer to
To prevent unintentional disabling of the Watchdog or unintentional change of time-out period,
two different safety levels are selected by the fuse WDTON as shown in Table 7-5. Refer to
“Timed Sequences for Changing the Configuration of the Watchdog Timer” on page 59
details.
Table 7-5.
Figure 7-7.
WDTON
Unprogrammed
Programmed
Symbol
V
t
I
BG
BG
BG
Table 7-6 on page
Parameter
Bandgap reference voltage
Bandgap reference start-up time
Bandgap reference current
consumption
Internal Voltage Reference Characteristics
WDT Configuration as a Function of the Fuse Settings of WDTON
Watchdog Timer
CC
Safety
Level
= 5V. See characterization data for typical values at other V
1
2
58. The WDR – Watchdog Reset – instruction resets the Watchdog
OSCILLATOR
WATCHDOG
Disabled
Enabled
WDT Initial
State
~1 MHz
Condition
How to Disable
the WDT
Timed sequence
Always enabled
AT90CAN32/64/128
Min.
1.0
Typ.
1.1
40
15
Table 7-6 on page
How to Change
Time-out
Timed sequence
Timed sequence
Max.
1.2
70
CC
levels. By
Units
µA
µs
V
58.
for
57