AT90CAN64 Automotive Atmel Corporation, AT90CAN64 Automotive Datasheet - Page 215
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AT90CAN64 Automotive
Manufacturer Part Number
AT90CAN64 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 AT90CAN64 Automotive
Flash (kbytes)
64 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)
4
Eeprom (bytes)
2048
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
- AT90CAN128_AUTOMOTIVE PDF datasheet #2
- AT90CAN128_AUTOMOTIVE PDF datasheet #3
- Current page: 215 of 431
- Download datasheet (6Mb)
7682C–AUTO–04/08
Even though this example is simple, it shows the principles involved in all TWI transmissions.
These can be summarized as follows:
2. When the START condition has been transmitted, the TWINT flag in TWCR is set, and
3. The application software should now examine the value of TWSR, to make sure that
4. When the address packet has been transmitted, the TWINT flag in TWCR is set, and
5. The application software should now examine the value of TWSR, to make sure that
6. When the data packet has been transmitted, the TWINT flag in TWCR is set, and
7. The application software should now examine the value of TWSR, to make sure that
• When the TWI has finished an operation and expects application response, the TWINT flag is
set. The SCL line is pulled low until TWINT is cleared.
the application has cleared TWINT, the TWI will initiate transmission of the START
condition.
TWSR is updated with a status code indicating that the START condition has success-
fully been sent.
the START condition was successfully transmitted. If TWSR indicates otherwise, the
application software might take some special action, like calling an error routine.
Assuming that the status code is as expected, the application must load SLA+W into
TWDR. Remember that TWDR is used both for address and data. After TWDR has
been loaded with the desired SLA+W, a specific value must be written to TWCR,
instructing the TWI hardware to transmit the SLA+W present in TWDR. Which value to
write is described later on. However, it is important that the TWINT bit is set in the value
written. Writing a one to TWINT clears the flag. The TWI will not start any operation as
long as the TWINT bit in TWCR is set. Immediately after the application has cleared
TWINT, the TWI will initiate transmission of the address packet.
TWSR is updated with a status code indicating that the address packet has success-
fully been sent. The status code will also reflect whether a slave acknowledged the
packet or not.
the address packet was successfully transmitted, and that the value of the ACK bit was
as expected. If TWSR indicates otherwise, the application software might take some
special action, like calling an error routine. Assuming that the status code is as
expected, the application must load a data packet into TWDR. Subsequently, a specific
value must be written to TWCR, instructing the TWI hardware to transmit the data
packet present in TWDR. Which value to write is described later on. However, it is
important that the TWINT bit is set in the value written. Writing a one to TWINT clears
the flag. The TWI will not start any operation as long as the TWINT bit in TWCR is set.
Immediately after the application has cleared TWINT, the TWI will initiate transmission
of the data packet.
TWSR is updated with a status code indicating that the data packet has successfully
been sent. The status code will also reflect whether a slave acknowledged the packet
or not.
the data packet was successfully transmitted, and that the value of the ACK bit was as
expected. If TWSR indicates otherwise, the application software might take some spe-
cial action, like calling an error routine. Assuming that the status code is as expected,
the application must write a specific value to TWCR, instructing the TWI hardware to
transmit a STOP condition. Which value to write is described later on. However, it is
important that the TWINT bit is set in the value written. Writing a one to TWINT clears
the flag. The TWI will not start any operation as long as the TWINT bit in TWCR is set.
Immediately after the application has cleared TWINT, the TWI will initiate transmission
of the STOP condition. Note that TWINT is NOT set after a STOP condition has been
sent.
AT90CAN32/64/128
215
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