TMPR3916 datasheet(134/225 Pages) TOSHIBA

134 / 225 page

Chapter 7 CAN Module (TXCAN)

Preliminary

7-13

7.2.6

Acceptance Filtering

For the mailboxes 0 to 14, the global acceptance mask (GAM) will be used if the bit GAME in the

mailbox is set. An incoming message will be stored in the first mailbox with a matching identifier. Only

if there is no matching identifier in the mailboxes 0 to 14, the incoming message will be compared to

the receive-only mailbox (mailbox 15). If the LAME bit in mailbox 15 is set, the local acceptance mask

(LAM) will be used. The acceptance code in the figure below is the content of the identifier words of

the current mailbox.

AMR1

RXRqst

Identifier

Acceptance Code Register

Acceptance Mask Register

ACR0

AMR1

ACRn

AMRn

Figure 7.2.3 Acceptance Filter Logic

Local Acceptance Mask (LAM)

The local acceptance mask register will only be used for filtering messages for mailbox 15. This

feature allows the user to locally mask, or “don’t care”, any identifier bits of the incoming message for

mailbox 15.

Bit

31302928

Name

LAMI



LAM

Bit

Name

Function

Reset

Value

Mode

LAMI

0 = The identifier extension bit stored in the mailbox determines

which messages shall be received.

1 = Don’t care: standard and extended frames can be received. In

case of an extended frame all 29 bits of the identifier stored in

the mailbox and all 29 bits of the local acceptance mask register

will be used for the filter. In case of a standard frame, only the

first eleven bits (bit 28 to 18) of the identifier and the local

acceptance mask will be used.

R/W

30:29



Wired to zero

28:0

LAM

Incoming messages are first checked for an acceptance match in

mailbox 0 to 14 before passing through the mailbox 15. A “1” value

means, “don’t care” or accept a “0” or “1” for that bit position. A “0”

value means that the incoming bit value must match identically to

the corresponding bit in the message identifier. The global mask has

no effect for mailbox 15. After power-up, all bits are cleared.

R/W

For messages in extended format the identifier extension bit and the whole 29 bits of the identifier

will be compared and for messages in standard format only the first 11 bits and the identifier extension

bit will be compared.

The local acceptance mask will only be used for mailbox 15 (receive-only mailbox).

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