SAM7X256 Atmel Corporation, SAM7X256 Datasheet - Page 528

• Manufacturer Part Number: SAM7X256
• Manufacturer: Atmel Corporation

Specifications of SAM7X256

• Flash (kbytes): 256 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): 64
• 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

Figure 36-18. Consumer Handling
36.7.4
36.7.4.1
Figure 36-19. Mailbox Timestamp
528
MTIMESTAMP
MTIMESTAMP
(CAN_MCRx)
(CAN_MSRx)
(CAN_MSRx)
(CAN_TSTP)
CAN_MDHx)
TIMESTAMP
(CAN_MSRx)
(CAN_MDLx
(CAN_MSRy)
(CAN_MR)
CAN BUS
CAN_TIM
CAN BUS
MRDY
MTCR
TEOF
MMI
SAM7X512/256/128
CAN Controller Timing Modes
Timestamping Mode
Using the free running 16-bit internal timer, the CAN controller can be set in one of the two fol-
lowing timing modes:
Timestamping Mode is enabled by clearing the TTM bit in the CAN_MR register. Time Triggered
Mode is enabled by setting the TTM bit in the CAN_MR register.
Each mailbox has its own timestamp value. Each time a message is sent or received by a mail-
box, the 16-bit value MTIMESTAMP of the CAN_TIMESTP register is transferred to the LSB bits
of the CAN_MSRx register. The value read in the CAN_MSRx register corresponds to the inter-
nal timer value at the Start Of Frame or the End Of Frame of the message handled by the
mailbox.
Remote Frame
Timestamp 1
• Timestamping Mode: The value of the internal timer is captured at each Start Of Frame or
• Time Triggered Mode: The mailbox transfer operation is triggered when the internal timer
Timestamp 1
Message 1
each End Of Frame.
reaches the mailbox trigger.
Start of Frame
Message x
End of Frame
Message x
Remote Frame
Message 2
Message y
Timestamp 2
Timestamp 2
Message y
6120I–ATARM–06-Apr-11