參數(shù)資料
型號(hào)： P83CE598
廠商： NXP Semiconductors N.V.
英文描述： 8-bit microcontroller with on-chip CAN
中文描述： 8位微控制器芯片的CAN
文件頁數(shù)： 42/108頁
文件大?。?/td> 507K
代理商： P83CE598
1996 Jun 27
42
Philips Semiconductors
Product specification
8-bit microcontroller with on-chip CAN
P8xCE598
13.5.7
A
CCEPTANCE
C
ODE
R
EGISTER
(ACR)
The Acceptance Code Register is part of the acceptance
filter of the CAN-controller. This register can be accessed
(read/write), if the Reset Request bit is set HIGH (present).
When a message is received which passes the
acceptance test and if there is an empty Receive Buffer,
then the respective Descriptor and Data Field
(see Fig.15) are sequentially stored in this empty buffer.
In the event that there is no empty Receive Buffer, the
Data Overrun bit is set HIGH (overrun); see
Sections 13.5.5 and 13.5.6.
When the complete message has been correctly received
the following occurs:
The Receive Buffer Status bit is set HIGH (full)
If the Receive Interrupt Enable bit is set HIGH (enabled),
the Receive Interrupt is set HIGH (set).
During transmission of a message which passes the
acceptance test, the message is also written to its own
Receive Buffer. If no Receiver Buffer is available, Data
Overrun is signalled because it is not known at the start of
a message whether the CAN-controller will lose arbitration
and so become a receiver of the message.
Table 41
Acceptance Code Register (address 4)
Table 42
Description of the ACR bits
7
6
5
4
3
2
1
0
AC.7
AC.6
AC.5
AC.4
AC.3
AC.2
AC.1
AC.0
BIT
SYMBOL
FUNCTION
7 to 0
AC.7 to
AC.0
Acceptance Code.
The Acceptance Code bits (AC.7 to AC.0) and the eight most
significant bits of the message's Identifier (ID.10 to ID.3) must be equal to those bit
positions which are marked relevant by the Acceptance Mask bits (AM.7 to AM.0).
The acceptance is given, if the following equation is satisfied:
(ID10 ... ID.3) = [(AC.7 ... AC.0) or (AM.7 ... AM.0)] = 1111 1111 B
13.5.8
A
CCEPTANCE
M
ASK
R
EGISTER
(AMR)
The Acceptance Mask Register is part of the acceptance
filter of the CAN-controller.
This register can be accessed (read/write) if the Reset
Request bit is set HIGH (present).
The Acceptance Mask Register qualifies which of the
corresponding bits of the acceptance code are ‘relevant’ or
‘don't care’ for acceptance filtering.
Table 43
Acceptance Mask Register (address 5)
Table 44
Description of the AMR bits
7
6
5
4
3
2
1
0
AM.7
AM.6
AM.5
AM.4
AM.3
AM.2
AM.1
AM.0
BIT
SYMBOL
FUNCTION
7 to 0
AM.7 to
AM.0
Acceptance Mask.
If the Acceptance Mask bit is:
HIGH (don’t care), then this bit position is ‘don’t care’ for the acceptance of a message.
LOW (relevant), then this bit position is ‘relevant’ for acceptance filtering.
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