AT90CAN32 Automotive Atmel Corporation, AT90CAN32 Automotive Datasheet - Page 57
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AT90CAN32 Automotive
Manufacturer Part Number
AT90CAN32 Automotive
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT90CAN128_AUTOMOTIVE.pdf
(431 pages)
2.AT90CAN128_AUTOMOTIVE.pdf
(16 pages)
3.AT90CAN128_AUTOMOTIVE.pdf
(225 pages)
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
- AT90CAN128_AUTOMOTIVE PDF datasheet
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- AT90CAN128_AUTOMOTIVE PDF datasheet #3
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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
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