AT90CAN32 Automotive Atmel Corporation, AT90CAN32 Automotive Datasheet - Page 57

• Manufacturer Part Number: AT90CAN32 Automotive
• Manufacturer: Atmel Corporation

Specifications of AT90CAN32 Automotive

• Flash (kbytes): 32 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 53
• Ext Interrupts: 8
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 2
• Can: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 2
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 125
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 8
• Input Capture Channels: 2
• Pwm Channels: 7
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

7.2.2
7.3
7.3.1
7682C–AUTO–04/08
Watchdog Timer
Voltage Reference Characteristics
Watchdog Timer Control Register – WDTCR
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
Bit
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
7
CC
Safety
Level
= 5V. See characterization data for typical values at other V
1
2
6
58. The WDR – Watchdog Reset – instruction resets the Watchdog
WDT Initial
State
Disabled
Enabled
5
4
Condition
3
How to Disable
the WDT
Timed sequence
Always enabled
2
AT90CAN32/64/128
Min.
1.0
1
Typ.
1.1
40
15
0
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