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參數資料
| 型號： | P83CE598FFB |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-bit microcontroller with CAN controller(帶CAN控制器的8位微控制器) |
| 中文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | PLASTIC, QFP-80 |
| 文件頁數： | 92/108頁 |
| 文件大?。?/td> | 661K |
| 代理商： | P83CE598FFB |
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1996 Jun 27
92
Philips Semiconductors
Product specification
8-bit microcontroller with on-chip CAN
P8xCE598
22 CAN APPLICATION INFORMATION
22.1
Latency time requirements
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.
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).
22.1.1
M
AXIMUM ALLOWED BIT
-
TIME CALCULATION
The maximum allowed bit-time (t
BIT
) due to latency time requirements can be calculated as:
(1)
Where:
t
MAX TRANSFER TIME
:
the maximum allowed transfer delay time (application-specific).
n
BIT, MAX LATENCY
:
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
BIT, MESSAGE
:
the number of bits of a message; it varies with the number of transferred data bytes
n
DATA BYTES
(0..8) and Stuffbits like:
(2)
Example:
For the calculation of n
BIT, MAX LATENCY
the following is assumed (the term ‘our message’ refers to that one the latency
time is calculated for):
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,
giving:
(3)
(4)
Where:
The additional 18 bits are due to the Error Frame and the Intermission Field preceding ‘our message’.
n
DATA BYTES, WORST CASE
denotes the number of data bytes contained by the longest message being used in a given
CAN network.
t
BIT
t
BIT, MAX LATENCY
n
BIT, MESSAGE
+
)
--n
≤
44
8.n
DATA BYTES
+
n
BIT, MESSAGE
52
10.n
DATABYTES
+
≤
≤
n
BIT, MAX LATENCY
44
8.n
DATA BYTES, WORST CASE
18
+
+
≥
n
BIT, MAX LATENCY
52
10.n
DATA BYTES, WORST CASE
18
+
+
≤
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