TMPR3916 datasheet(127/225 Pages) TOSHIBA

127 / 225 page

Chapter 7 CAN Module (TXCAN)

Preliminary

7-6

7.2.2

Control Registers

Mailbox Configuration Register (MC)

Bit

Name

Bit

Name

Function

Reset

Value

Mode

15:0

Mailbox Enable

0 = The corresponding mailbox MBn is disabled for the CAN module

and the write access to the identifier field of the mailbox is

possible.

1 = The mailbox is enabled for the TXCAN state machine. Write

access to the identifier field of an enabled mailbox is denied.

Write access to the data field and control field of a mailbox is always

possible. After power-up, all bits in MC are cleared and all

mailboxes are disabled.

R/W

Special care is required during reprogramming of MC in operation:

For a receive mailbox it needs to be ensured that the mailbox is not being disabled while a reception

for this mailbox is ongoing. If a mailbox is disabled during an ongoing reception, the user must be

aware that the current frame might be received, even though the mailbox has been disabled or

reconfigured during the reception of the incoming CAN frame.

A transmit mailbox may never be disabled, when a transmit request is pending.

Mailbox Direction Register (MD)

Bit

Name

MD15

MD14 .. MD0

Bit

Name

Function

Reset

Value

Mode

MD15

Mailbox Direction of Mailbox 15

Mailbox 15 is receive-only. This bit is always 1 and cannot be

changed.

14:0

MD14

MD0

Mailbox Direction of Mailboxes 14 to 0

Each mailbox can be configured as transmit mailbox or receive

mailbox.

0 = Transmit mailbox

1 = Receive mailbox

R/W

The direction of mailboxes may not be changed in operation. A mailbox needs to be disabled before

its direction may be changed.

TMPR3916 Datasheet(PDF) 127 Page - Toshiba Semiconductor

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