AT90CAN32 Atmel Corporation, AT90CAN32 Datasheet - Page 253
AT90CAN32
Manufacturer Part Number
AT90CAN32
Description
Manufacturer
Atmel Corporation
Specifications of AT90CAN32
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 85
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
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19.10.2
7679H–CAN–08/08
CAN General Status Register - CANGSTA
• Bit 0 – SWRES: Software Reset Request
This auto resettable bit only resets the CAN controller.
• Bit 7 – Reserved Bit
This bit is reserved for future use.
• Bit 6 – OVRG: Overload Frame Flag
This flag does not generate an interrupt.
• Bit 5 – Reserved Bit
This bit is reserved for future use.
• Bit 4 – TXBSY: Transmitter Busy
This flag does not generate an interrupt.
• Bit 3 – RXBSY: Receiver Busy
This flag does not generate an interrupt.
• Bit 2 – ENFG: Enable Flag
Initial Value
Read/Write
Bit
– 0 - standby mode: The on-going transmission (if exists) is normally terminated and the
– 1 - enable mode: The CAN channel enters in enable mode once 11 recessive bits
– 0 - no reset
– 1 - reset: this reset is “ORed” with the hardware reset.
– 0 - no overload frame.
– 1 - overload frame: set by hardware as long as the produced overload frame is sent.
– 0 - transmitter not busy.
– 1 - transmitter busy: set by hardware as long as a frame (data, remote, overload or
– 0 - receiver not busy
– 1 - receiver busy: set by hardware as long as a frame is received or monitored.
CAN channel is frozen (the CONMOB bits of every MOb do not change). The transmitter
constantly provides a recessive level. In this mode, the receiver is not enabled but all the
registers and mailbox remain accessible from CPU.
has been read.
error frame) or an ACK field is sent. Also set when an inter frame space is sent.
Note:
7
-
-
-
A standby mode applied during a reception may corrupt the on-going reception or set the
controller in a wrong state. The controller will restart correctly from this state if a software
reset (SWRES) is applied. If no reset is considered, a possible solution is to wait for a
lake of a receiver busy (RXBSY) before to enter in stand-by mode. The best solution is
first to apply an abort request command (ABRQ) and then wait for the lake of the receiver
busy (RXBSY) before to enter in stand-by mode. In any cases, this standby mode behav-
ior has no effect on the CAN bus integrity.
OVRG
R
6
0
5
-
-
-
TXBSY
4
R
0
RXBSY
R
3
0
ENFG
R
2
0
AT90CAN32/64/128
BOFF
R
1
0
ERRP
R
0
0
CANGSTA
253
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