AT90CAN128 Automotive Atmel Corporation, AT90CAN128 Automotive Datasheet - Page 229
AT90CAN128 Automotive
Manufacturer Part Number
AT90CAN128 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 AT90CAN128 Automotive
Flash (kbytes)
128 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)
4096
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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Figure 18-18. Formats and States in the Slave Transmitter Mode
18.8.5
Table 18-7.
7682C–AUTO–04/08
Status Code
(TWSR)
Prescaler Bits
are 0
0xF8
0x00
Miscellaneous States
Status of the Two-wire Serial Bus
and Two-wire Serial Interface
Hardware
No relevant state information
available; TWINT = “0”
Bus error due to an illegal START
or STOP condition
Miscellaneous States
There are two status codes that do not correspond to a defined TWI state, see
Status 0xF8 indicates that no relevant information is available because the TWINT flag is not
set. This occurs between other states, and when the TWI is not involved in a serial transfer.
Status 0x00 indicates that a bus error has occurred during a Two-wire Serial Bus transfer. A bus
error occurs when a START or STOP condition occurs at an illegal position in the format frame.
Examples of such illegal positions are during the serial transfer of an address byte, a data byte,
or an acknowledge bit. When a bus error occurs, TWINT is set. To recover from a bus error, the
TWSTO flag must set and TWINT must be cleared by writing a logic one to it. This causes the
TWI to enter the not addressed slave mode and to clear the TWSTO flag (no other bits in TWCR
are affected). The SDA and SCL lines are released, and no STOP condition is transmitted.
To/from TWDR
No TWDR action
No TWDR action
Application Software Response
To TWCR
STA
No TWCR action
0
STO
1
TWINT
1
TWEA
X
Wait or proceed current transfer
Only the internal hardware is affected, no STOP condition
is sent on the bus. In all cases, the bus is released and
TWSTO is cleared.
AT90CAN32/64/128
Next Action Taken by TWI Hardware
Table
18-7.
229
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