參數(shù)資料
型號： CR16MCT5VJE7Y
英文描述： Microcontroller
中文描述： 微控制器
文件頁數(shù)： 110/157頁
文件大?。?/td> 1256K
代理商： CR16MCT5VJE7Y
www.national.com
110
Setting the DDIR bit to “1” will cause the direction of the data
storage to be reversed — the last byte received is stored at
the highest address and the first byte is stored at the lowest
address. See Figure 70 for illustration.
LO
Listen Only — By setting the LO-bit to “1” the
CR16CAN interface is configured to behave
only as a receiver. This means:
it cannot transmit any message.
it cannot send a dominant ACK bit.
when errors are detected on the bus, the
CR16CAN will behave as in the error pas-
sive mode.
Using this listen only function, the CR16CAN
interface can be adjusted when it gets connect-
ed to an operating network with unknown bus
speed.
Ignore Acknowledge. If the ignore ACK func-
tion is enabled, then by setting the IGNACK bit
to “1”, CR16CAN does not expect to receive a
dominant ACK bit to indicate the validity of a
transmitted message. It will not send an error
frame when the transmitted frame in not ac-
knowledged by any other CAN node.
This feature can be used in conjunction with
the LOOPBACK option for stand-alone tests
outside of a CAN network.
LOOPBACK Loopback. By setting the LOOPBACK bit, all
messages sent by CR16CAN can also be re-
ceived by a CR16CAN buffer with a matching
buffer ID. However, CR16CAN does not ac-
knowledge a message sent by itself. Therefore
CR16CAN will send an error frame when no
other device connected to the bus has ac-
knowledged the message.
INTERNAL
Internal. If the INTERNAL function is enabled,
the TX- and RX-pin of the CR16CAN are inter-
nally connected to each other. This feature can
be used in conjunction with the LOOPBACK
mode. This means that CR16CAN can receive
its own sent messages without connecting an
external transceiver chip to the RX- and TX-
pin; it allows the user to run real stand-alone
tests without any peripheral devices.
IGNACK
DIAGEN
Diagnostic Enable. The DIAGEN bit globally
enables or disables the special diagnostic fea-
tures of CR16CAN. This includes the following
functions:
LO (Listen Only)
IGNACK (Ignore Acknowledge)
LOOPBACK (Loopback)
INTERNAL (Internal Loopback)
write access to hidden receive buffer
Error Interrupt Type. This bit configures when
the Error Interrupt Pending Bit (CIPND.EIPND)
is set and an error interrupt is generated if en-
abled
by
the
Error
(CIEN.EIEN).
“0”
The EIPND bit is set on every error on the
CAN bus.
“1”
The EIPND bit is set only if the error state
(CSTPND.NS) changes as a result of in-
crementing either the receive or transmit
error counter.
EIT
Interrupt
Enable
t
ADDRoffset
Data Bytes
Data1
Data2
Data3
Data4
Data5
Data6
Data7
Data8
Sequence of Data Bytes on the Bus
Storage of Data Bytes
in the Buffer Memory
Data1
Data3
Data2
Data4
Data5
Data6
Data7
Data8
ID
CRC
Figure 70.
Data Direction Bit set to ‘1’
0A
16
08
16
06
16
04
16
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