AT91SAM7X128-CU Atmel, AT91SAM7X128-CU Datasheet - Page 527
AT91SAM7X128-CU
Manufacturer Part Number
AT91SAM7X128-CU
Description
MCU ARM 128K HS FLASH 100-TFBGA
Manufacturer
Atmel
Series
AT91SAMr
Datasheet
1.AT91SAM7X512-AU-999.pdf
(687 pages)
Specifications of AT91SAM7X128-CU
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
128KB (128K x 8)
Program Memory Type
FLASH
Ram Size
32K 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-TFBGA
For Use With
AT91SAM-ICE - EMULATOR FOR AT91 ARM7/ARM9AT91SAM7X-EK - KIT EVAL FOR AT91SAM7X256/128
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AT91SAM7X128-CU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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Figure 36-15. Transmitting Messages
36.7.3.6
6120H–ATARM–17-Feb-09
(CAN_MCRx)
(CAN_MSRx)
(CAN_MSRx)
(CAN_MCRx)
CAN BUS
Reading CAN_MSRx
Writing CAN_MDHx &
MACR
MRDY
MABT
MTCR
Remote Frame Handling
CAN_MDLx
mailbox 5 have the same priority and have a message to send at the same time, then the mes-
sage of the mailbox 0 is sent first.
Setting the MACR bit in the CAN_MCRx register aborts the transmission. Transmission for sev-
eral mailboxes can be aborted by writing MBx fields in the CAN_MACR register. If the message
is being sent when the abort command is set, then the application is notified by the MRDY bit set
and not the MABT in the CAN_MSRx register. Otherwise, if the message has not been sent,
then the MRDY and the MABT are set in the CAN_MSR register.
When the bus arbitration is lost by a mailbox message, the CAN controller tries to win the next
bus arbitration with the same message if this one still has the highest priority. Messages to be
sent are re-tried automatically until they win the bus arbitration. This feature can be disabled by
setting the bit DRPT in the CAN_MR register. In this case if the message was not sent the first
time it was transmitted to the CAN transceiver, it is automatically aborted. The MABT flag is set
in the CAN_MSRx register until the next transfer command.
Figure 36-15
The first MBx message is sent, the second is aborted and the last one is trying to be aborted but
too late because it has already been transmitted to the CAN transceiver.
Producer/consumer model is an efficient means of handling broadcasted messages. The push
model allows a producer to broadcast messages; the pull model allows a customer to ask for
messages.
shows three MBx message attempts being made (MRDY of MBx set to 0).
MBx message
AT91SAM7X512/256/128 Preliminary
Abort MBx message
Try to Abort MBx message
MBx message
527
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