MPC564EVB Freescale Semiconductor, MPC564EVB Datasheet - Page 704
![KIT EVAL FOR MPC561/562/563/564](/photos/39/39/393946/mpc564evbimage_sml.jpg)
MPC564EVB
Manufacturer Part Number
MPC564EVB
Description
KIT EVAL FOR MPC561/562/563/564
Manufacturer
Freescale Semiconductor
Type
Microcontrollerr
Specifications of MPC564EVB
Contents
Module Board, Installation Guide, Power Supply, Cable, Software and more
Processor To Be Evaluated
MPC56x
Data Bus Width
32 bit
Interface Type
RS-232, Ethernet
For Use With/related Products
MPC561, 562, 563, 564
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
- Current page: 704 of 1420
- Download datasheet (11Mb)
CAN 2.0B Controller Module
16.3.3.1
The following considerations must be observed when programming bit timing functions.
16.3.4
The TouCAN has two error counters, the transmit (Tx) error counter and the receive (Rx) error counter.
Refer to
increasing and decreasing these counters are described in the CAN protocol, and are fully implemented in
the TouCAN. Each counter has the following features:
16-10
•
•
•
•
•
•
•
•
•
If the programmed PRESDIV value results in a single system clock per one time quantum, then the
PSEG2 field in CANCTRL2 register must not be programmed to zero.
If the programmed PRESDIV value results in a single system clock per one time quantum, then the
information processing time (IPT) equals three time quanta; otherwise it equals two time quanta.
If PSEG2 equals two, then the TouCAN transmits one time quantum late relative to the scheduled
sync segment.
If the prescaler and bit timing control fields are programmed to values that result in fewer than 10
system clock periods per CAN bit time and the CAN bus loading is 100%, then any time the rising
edge of a start-of-frame (SOF) symbol transmitted by another node occurs during the third bit of
the intermission between messages, the TouCAN may not be able to prepare a message buffer for
transmission in time to begin its own transmission and arbitrate against the message which
transmitted the early SOF.
The TouCAN bit time must be programmed to be greater than or equal to nine system clocks, or
correct operation is not guaranteed.The duration of the synchronization segment, SYNC_SEG, is
not programmable and is fixed at one time quantum.
Eight-bit up/down-counter
Increment by eight (Rx error counter also increments by one)
Decrement by one
Avoid decrement when equal to zero
Rx error counter reset to a value between 119 and 127 inclusive, when the TouCAN transitions
from error passive to error active
Section 16.7, “Programming
System Clock
Table 16-8. Example System Clock, CAN Bit Rate, and S-Clock Frequencies (continued)
Frequency
Error Counters
(MHz)
Configuring the TouCAN Bit Timing
16
56
40
25
20
16
CAN Bit Rate
(MHz)
0.500
0.125
0.125
0.125
0.125
0.125
MPC561/MPC563 Reference Manual, Rev. 1.2
Model,” for more information on error counters. The rules for
Possible S-Clock
Frequency (MHz)
1, 1.25, 2.5
1, 2, 2.5
1, 2
1, 2
1, 2
1, 2
Possible Number of
Time Quanta/Bit
8, 16, 20
8,10, 20
8, 16
8, 16
8,16
2, 4
PRESDIV Value + 1
25, 20,10
20, 10, 8
Freescale Semiconductor
56, 28
40, 20
16, 8
16, 8
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