AT91SAM7X512-AU-999 Atmel, AT91SAM7X512-AU-999 Datasheet - Page 513
AT91SAM7X512-AU-999
Manufacturer Part Number
AT91SAM7X512-AU-999
Description
IC MCU ARM 512K HS FLASH 100LQFP
Manufacturer
Atmel
Series
AT91SAMr
Datasheet
1.AT91SAM7X512-AU-999.pdf
(687 pages)
Specifications of AT91SAM7X512-AU-999
Core Processor
ARM7
Core Size
16/32-Bit
Speed
55MHz
Connectivity
CAN, Ethernet, I²C, SPI, SSC, UART/USART, USB
Peripherals
Brown-out Detect/Reset, DMA, POR, PWM, WDT
Number Of I /o
62
Program Memory Size
512KB (512K x 8)
Program Memory Type
FLASH
Ram Size
128K x 8
Voltage - Supply (vcc/vdd)
1.65 V ~ 1.95 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
100-LQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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Manufacturer
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Price
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Figure 36-5. CAN Bit Timing
6120H–ATARM–17-Feb-09
CAN Clock
MCK
SYNC_
t
CSC
SEG
The SAMPLE POINT is the point in time at which the bus level is read and interpreted as the
value of that respective bit. Its location is at the end of PHASE_SEG1.
The ReSynchronization Jump Width defines the limit to the amount of lengthening or shortening
of the Phase Segments.
SJW is programmable to be the minimum of PHASE SEG1 and 4 TQ.
If the SMP field in the CAN_BR register is set, then the incoming bit stream is sampled three
times with a period of half a CAN clock period, centered on sample point.
In the CAN controller, the length of a bit on the CAN bus is determined by the parameters (BRP,
PROPAG, PHASE1 and PHASE2).
The time quantum is calculated as follows:
Note: The BRP field must be within the range [1, 0x7F], i.e., BRP = 0 is not authorized.
To compensate for phase shifts between clock oscillators of different controllers on the bus, the
CAN controller must resynchronize on any relevant signal edge of the current transmission. The
resynchronization shortens or lengthens the bit time so that the position of the sample point is
shifted with regard to the detected edge. The resynchronization jump width (SJW) defines the
maximum of time by which a bit period may be shortened or lengthened by resynchronization.
Example of bit timing determination for CAN baudrate of 500 Kbit/s:
PROP_SEG
• SJW: ReSynchronization Jump Width.
t
PRS
MCK = 48MHz
CAN baudrate= 500kbit/s => bit time= 2us
t
t
BIT
CSC
t
t
t
PRS
PHS2
PHS1
t
SJW
=
=
=
t
CSC
=
=
(
=
BRP
t
CSC
NOMINAL BIT TIME
t
t
AT91SAM7X512/256/128 Preliminary
t
CSC
CSC
CSC
PHASE_SEG1
+
t
×
+
PRS
×
×
×
t
1
(
PHS1
PROPAG
)
(
(
(
PHASE2
SJW
PHASE1
⁄
+
t
MCK
PHS1
+
1
+
)
+
+
+
t
1
PHS2
1
1
)
)
)
Sample Point
PHASE_SEG2
t
PHS2
Transmission Point
513
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