CR16MCS5VJI8 Datasheet

IC型号：
CR16MCS5VJI8
PDF描述：
Family of 16-bit CAN-enabled CompactRISC Microcontrollers
文件大小：
713.21KB
PDF页数：
156页
芯片厂家：
NSC

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A dedicated acceptance filtering procedure enables the user

to configure each buffer to receive only a single message ID

or a group of messages. One buffer uses an independent fil-

tering procedure, which provides the possibility to establish a

BASIC-CAN path.

For reception of data frame or remote frames, the CR16CAN

follows a 鈥渞eceive on first match鈥?rule which means that a giv-

en message is only received by one buffer 鈥?the first one

which matches to the received message ID.

The transmission of a frame can be initiated by the user soft-

ware writing to the transmit status and priority register. An al-

ternate way to schedule a transmission is the automatic

answer to remote frames. In the latter case, the CR16CAN

will schedule every buffer for transmission to respond to re-

mote frames with a given identifier if the acceptance mask

matches. This implies that a single remote frame is able to

poll multiple matching buffers configured to respond to the

triggering remote transmission request.

the hidden buffer are copied into the first buffer with matching

filtering mask.

Bits holding a 鈥?鈥?in the global filtering mask (GMASK) can be

represented as a 鈥渄on鈥檛 care鈥?of the associated bit of each

buffer identifier, regardless of whether the buffer identifier bit

is 鈥?鈥?or 鈥?鈥?

This provides the capability to accept only a single ID per

buffer or to accept a group of IDs. The following two exam-

ples illustrate the difference.

Example 1: Acceptance of a Single Identifier

If the global mask is set to 00

the acceptance filtering of an

incoming message is only determined by the individual buffer

ID. This means that only one message ID is accepted per

buffer.

GMASK1

00000000

GMASK2

00000000

00000

20.4

ACCEPTANCE FILTERING

Two 32-bit masks are used to filter unwanted messages from

the CAN bus GMASK and BMASK. Figure56 shows the

mask and the buffers controlled by the masks.

Buffer 0

BUFFER_ID

BUFFER_ID1

10101010

BUFFER_ID2

10101010

10101

Accepted ID

10101010

10101

Figure 57.

GMASK1

GMASK2

Buffer13

BUFFER_ID

Acceptance of a Single Identifier

Example 2: Reception of an Identifier Group

Bits in the global mask register set to 鈥?鈥?change the corre-

sponding bit status within the buffer ID to 鈥渄on鈥檛 care鈥?(鈥淴鈥?.

Therefore all messages which match the non-鈥渄on鈥檛 care鈥?/div>

bits are accepted.

GMASK1

GMASK2

00000000

00000

Buffer14

BMASK1

BMASK2

BUFFER_ID

00000000

11111111

BUFFER_ID1

10101010

BUFFER_ID2

10101010

10101

Accepted ID group

Figure 56.

Acceptance Filtering Structure

10101010

XXXXXXXX

10101010

10101

The acceptance filtering of the incoming messages for the

buffers 0...13 is done by means of a global filtering mask

(GMASK) and by the buffer ID of each buffer.

The acceptance filtering of incoming messages for buffer 14

is done via a separate filtering mask (BMASK) and by the

buffer ID of each that buffer.

Once a received message is waiting in the hidden buffer (see

Receive Buffer Structure on page 98) to be copied into a buff-

er, CR16CAN scans all buffer configured as receive buffers

for a matching filtering mask. The buffers 0 to 13 are checked

in ascending order beginning with buffer 0. The contents of

Figure 58. Acceptance of a Group of Identifiers

A separate filtering path is used for buffer 14. For this buffer

the acceptance filtering is established by the buffer ID in con-

junction with the basic filtering mask. This basic mask uses

the same method as the global mask. Setting a bit to 鈥?鈥?/div>

changes the associated bit in the buffer ID to a 鈥渄on鈥檛 care鈥?/div>

bit.

Therefore the basic mask allows a large number of infrequent

messages to be received by this buffer.

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