SAM7X512 Atmel Corporation, SAM7X512 Datasheet - Page 506
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SAM7X512
Manufacturer Part Number
SAM7X512
Description
Manufacturer
Atmel Corporation
Specifications of SAM7X512
Flash (kbytes)
512 Kbytes
Pin Count
100
Max. Operating Frequency
55 MHz
Cpu
ARM7TDMI
Hardware Qtouch Acquisition
No
Max I/o Pins
62
Ext Interrupts
62
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Twi (i2c)
1
Uart
3
Can
1
Ssc
1
Ethernet
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
384
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
128
Self Program Memory
NO
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
3.3
Operating Voltage (vcc)
3.0 to 3.6
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
3
Input Capture Channels
3
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
No
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36.6
36.6.1
36.6.2
36.6.2.1
506
CAN Controller Features
SAM7X512/256/128
CAN Protocol Overview
Mailbox Organization
Message Acceptance Procedure
The Controller Area Network (CAN) is a multi-master serial communication protocol that effi-
ciently supports real-time control with a very high level of security with bit rates up to 1 Mbit/s.
The CAN protocol supports four different frame types:
The Atmel CAN controller provides the CPU with full functionality of the CAN protocol V2.0 Part
A and V2.0 Part B. It minimizes the CPU load in communication overhead. The Data Link Layer
and part of the physical layer are automatically handled by the CAN controller itself.
The CPU reads or writes data or messages via the CAN controller mailboxes. An identifier is
assigned to each mailbox. The CAN controller encapsulates or decodes data messages to build
or to decode bus data frames. Remote frames, error frames and overload frames are automati-
cally handled by the CAN controller under supervision of the software application.
The CAN module has 8 buffers, also called channels or mailboxes. An identifier that corre-
sponds to the CAN identifier is defined for each active mailbox. Message identifiers can match
the standard frame identifier or the extended frame identifier. This identifier is defined for the first
time during the CAN initialization, but can be dynamically reconfigured later so that the mailbox
can handle a new message family. Several mailboxes can be configured with the same ID.
Each mailbox can be configured in receive or in transmit mode independently. The mailbox
object type is defined in the MOT field of the CAN_MMRx register.
If the MIDE field in the CAN_MIDx register is set, the mailbox can handle the extended format
identifier; otherwise, the mailbox handles the standard format identifier. Once a new message is
received, its ID is masked with the CAN_MAMx value and compared with the CAN_MIDx value.
If accepted, the message ID is copied to the CAN_MIDx register.
• Data frames: They carry data from a transmitter node to the receiver nodes. The overall
• Remote frames: A destination node can request data from the source by sending a remote
• Error frames: An error frame is generated by any node that detects a bus error.
• Overload frames: They provide an extra delay between the preceding and the successive
maximum data frame length is 108 bits for a standard frame and 128 bits for an extended
frame.
frame with an identifier that matches the identifier of the required data frame. The appropriate
data source node then sends a data frame as a response to this node request.
data frames or remote frames.
6120I–ATARM–06-Apr-11
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