AT91SAM7X128 Atmel, AT91SAM7X128 Datasheet - Page 510
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AT91SAM7X128
Manufacturer Part Number
AT91SAM7X128
Description
MCU 32-Bit 91S ARM7TDMI RISC 128KB Flash 1.8V/3.3V 100-Pin LQFP
Manufacturer
Atmel
Datasheet
1.AT91SAM7X512-AU-999.pdf
(687 pages)
Specifications of AT91SAM7X128
Package
100LQFP
Device Core
ARM7TDMI
Family Name
91S
Maximum Speed
55 MHz
Ram Size
32 KB
Program Memory Size
128 KB
Operating Supply Voltage
1.8|3.3 V
Data Bus Width
32 Bit
Program Memory Type
Flash
Number Of Programmable I/os
62
Interface Type
CAN/Ethernet/SPI/I2S/TWI/USART/USB
On-chip Adc
8-chx10-bit
Operating Temperature
-40 to 85 °C
Number Of Timers
3
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36.6.2.2
36.6.2.3
6120H–ATARM–17-Feb-09
Receive with overwrite
Mailbox Object Type
Mailbox Object Type
Consumer
Producer
Transmit
Receive
Receive Mailbox
Transmit Mailbox
When the CAN module receives a message, it looks for the first available mailbox with the low-
est number and compares the received message ID with the mailbox ID. If such a mailbox is
found, then the message is stored in its data registers. Depending on the configuration, the mail-
box is disabled as long as the message has not been acknowledged by the application (Receive
only), or, if new messages with the same ID are received, then they overwrite the previous ones
(Receive with overwrite).
It is also possible to configure a mailbox in Consumer Mode. In this mode, after each transfer
request, a remote frame is automatically sent. The first answer received is stored in the corre-
sponding mailbox data registers.
Several mailboxes can be chained to receive a buffer. They must be configured with the same
ID in Receive Mode, except for the last one, which can be configured in Receive with Overwrite
Mode. The last mailbox can be used to detect a buffer overflow.
When transmitting a message, the message length and data are written to the transmit mailbox
with the correct identifier. For each transmit mailbox, a priority is assigned. The controller auto-
matically sends the message with the highest priority first (set with the field PRIOR in
CAN_MMRx register).
It is also possible to configure a mailbox in Producer Mode. In this mode, when a remote frame
is received, the mailbox data are sent automatically. By enabling this mode, a producer can be
done using only one mailbox instead of two: one to detect the remote frame and one to send the
answer.
Description
The first message received is stored in mailbox data registers. Data remain available until the
next transfer request.
The last message received is stored in mailbox data register. The next message always
overwrites the previous one. The application has to check whether a new message has not
overwritten the current one while reading the data registers.
A remote frame is sent by the mailbox. The answer received is stored in mailbox data register.
This extends Receive mailbox features. Data remain available until the next transfer request.
Description
The message stored in the mailbox data registers will try to win the bus arbitration immediately
or later according to or not the Time Management Unit configuration (see
The application is notified that the message has been sent or aborted.
The message prepared in the mailbox data registers will be sent after receiving the next remote
frame. This extends transmit mailbox features.
AT91SAM7X512/256/128 Preliminary
Section
36.6.3).
510
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