TMPR3916 datasheet(152/225 Pages) TOSHIBA

152 / 225 page

Chapter 7 CAN Module (TXCAN)

Preliminary

7-31

7.5.2

Transmitting Messages

The following flowchart shows the handling of transmit objects by using the transmit interrupt IRQ1.

It is also possible to use polling. In this case, the “waiting for IRQ1” in the flowchart must be

replaced by polling TA. Enabling interrupts and clearing MBTIF must be removed from the flow.

Setup a mailbox for

message transmission

Configure mailbox for

transmission:

set MDn to “0”

Disable mailbox:

set MCn to “0”

Setup mailbox identifier

and IDE bit for standard

or extended ID

Enable interrupts:

set MBIMn to “1”

Enable mailbox:

set MCn to “1”

End of setup

Transmitting messages

New setup for

the mailbox?

Yes

Update mailbox

data?

Write new data to the

mailbox

Yes

Set transmission

request:

set TRSn to “1”

Transmission

requested?

Yes

Check TA to determine

the mailbox with TA set

Choose transmission

order:

setup MTOS

Special user tasks ...

(Update mailbox data?)

Clear TA and MBTIF

and return from interrupt

service routine

Wait for IRQ1

Figure 7.5.2 Transmitting Objects Using IRQ1

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