pca82c200t NXP Semiconductors, pca82c200t Datasheet - Page 92
pca82c200t
Manufacturer Part Number
pca82c200t
Description
8-bit Microcontroller With On-chip Can
Manufacturer
NXP Semiconductors
Datasheet
1.PCA82C200T.pdf
(108 pages)
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Philips Semiconductors
22 CAN APPLICATION INFORMATION
22.1
Real-time applications require the ability to process and
transfer information in a limited and predetermined period
of time. If knowing this total time and the time required to
process the information, the (maximum allowed) transfer
delay time is given.
22.1.1
The maximum allowed bit-time (t
Where:
Example:
For the calculation of n
time is calculated for):
giving:
Where:
1996 Jun 27
t
the maximum allowed transfer delay time (application-specific).
n
the maximum latency time (in terms of number of bits), which depends on the
actual state of the CAN network (e.g. another message already on the network).
n
the number of bits of a message; it varies with the number of transferred data bytes
n
Since at maximum one-bit-time ago another CAN Controller is transmitting
A single error occurs during the transmission of that message preceding ours, leading to the additional transfer of one
Error Frame
‘our message’ has the highest priority,
The additional 18 bits are due to the Error Frame and the Intermission Field preceding ‘our message’.
n
CAN network.
8-bit microcontroller with on-chip CAN
MAX TRANSFER TIME
BIT, MAX LATENCY
BIT, MESSAGE
DATA BYTES
DATA BYTES, WORST CASE
Latency time requirements
M
AXIMUM ALLOWED BIT
(0..8) and Stuffbits like:
:
:
:
BIT, MAX LATENCY
denotes the number of data bytes contained by the longest message being used in a given
44
n
n
BIT, MAX LATENCY
-
BIT, MAX LATENCY
TIME CALCULATION
+
BIT
8.n
) due to latency time requirements can be calculated as:
t
DATA BYTES
BIT
the following is assumed (the term ‘our message’ refers to that one the latency
-------------------------------------------------------------------------------------------- -
n
BIT, MAX LATENCY
52
44
n
t
BIT, MESSAGE
+
MAX TRANSFER TIME
+
10.n
8.n
DATA BYTES, WORST CASE
92
DATA BYTES, WORST CASE
It is measured from the initiation of the transfer up to the
signalling of reception.
For instance, this is the period of time between
programming the CAN Command Register bit 0
(Transmission Request) to HIGH and the time getting an
interrupt at a receiving CAN-device (due to the reception
of the respective message).
+
n
BIT, MESSAGE
52
+
10.n
DATABYTES
+
+
18
18
Product specification
P8xCE598
(1)
(2)
(3)
(4)
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