SAM7X256_14 Datasheet, PDF (499/662 Pages) ATMEL Corporation – ARM-based Flash MCU

Figure 36-13. Chaining Three Mailboxes to Receive a Buffer Split into Three Messages
Buffer split in 3 messages
CAN BUS
Message s1
Message s2
Message s3
MRDY
(CAN_MSRx)
MMI
(CAN_MSRx)
MRDY
(CAN_MSRy)
MMI
(CAN_MSRy)
MRDY
(CAN_MSRz)
MMI
(CAN_MSRz)
Reading CAN_MSRx, CAN_MSRy and CAN_MSRz
Reading CAN_MDH & CAN_MDL for mailboxes x, y and z
Writing MBx MBy MBz in CAN_TCR
If the number of mailboxes is not sufficient (the MMI flag of the last mailbox raises), the user must read each data
received on the last mailbox in order to retrieve all the messages of the buffer split (see Figure 36-14).
Figure 36-14. Chaining Three Mailboxes to Receive a Buffer Split into Four Messages
Buffer split in 4 messages
CAN BUS
MRDY
(CAN_MSRx)
MMI
(CAN_MSRx)
MRDY
(CAN_MSRy)
MMI
(CAN_MSRy)
MRDY
(CAN_MSRz)
MMI
(CAN_MSRz)
Message s1
Message s2
Message s3
Message s4
Reading CAN_MSRx, CAN_MSRy and CAN_MSRz
Reading CAN_MDH & CAN_MDL for mailboxes x, y and z
Writing MBx MBy MBz in CAN_TCR
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
499