MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 587

• Manufacturer Part Number: MPC555CME
• Description: KIT EVALUATION FOR MPC555
• Manufacturer: Freescale Semiconductor
• Type: Microcontrollerr

Specifications of MPC555CME

• Contents: Module Board, Installation Guide, Power Supply, Cable, Software and more
• Processor To Be Evaluated: MPC555
• Data Bus Width: 32 bit
• Interface Type: RS-232
• For Use With/related Products: MPC555
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

MPC555
USER’S MANUAL
Time Stamp
New Frame
NOTES:
NOTES:
Before Rx
Rx Length
Tx Length
Reserved
Rx Code
0b0XY1
0b0000
0b0100
0b0010
0b0110
1. For Tx message buffers, upon read, the BUSY bit should be ignored.
1. When a matching remote request frame is detected, the code for such a message buffer is changed to be
Field
Code
RTR
Data
X
0
1
0
0
1110.
/
MPC556
1
Initial Tx Code
Contains a copy of the high byte of the free running timer, which is captured at the beginning of the
identifier field of the frame on the CAN bus.
Refer to
Length (in bytes) of the Rx data stored in offset 0x6 through 0xD of the buffer.This field is written by
the TouCAN module, copied from the DLC (data length code) field of the received frame.
Length (in bytes) of the data to be transmitted, located in offset 0x6 through 0xD of the buffer. This
field is written by the CPU and is used as the DLC field value. If RTR (remote transmission request)
= 1, the frame is a remote frame and will be transmitted without data field, regardless of the value in
Tx length.
This field can store up to eight data bytes for a frame. For Rx frames, the data is stored as it is re-
ceived from the bus. For Tx frames, the CPU provides the data to be transmitted within the frame.
The CPU controls access to this word entry field (16 bits).
NOT ACTIVE — message buffer is not active.
EMPTY — message buffer is active and empty.
FULL — message buffer is full.
OVERRUN — second frame was received into a full
buffer before the CPU read the first one.
BUSY — message buffer is now being filled with a new
receive frame. This condition will be cleared within 20
cycles.
Table 16-1 Common Extended/Standard Format Frames
Table 16-3 Message Buffer Codes for Transmit Buffers
0b1010
Table 16-2 Message Buffer Codes for Receive Buffers
0b1000
0b1100
0b1100
0b1110
Table 16-2
1
Message buffer not ready for transmit.
Data frame to be transmitted once, unconditionally.
Remote frame to be transmitted once, and message buffer be-
comes an RX message buffer for data frames.
Data frame to be transmitted only as a response to a remote
frame, always.
Data frame to be transmitted only once, unconditionally, and
then only as a response to remote frame, always.
and
Description
CAN 2.0B CONTROLLER MODULE
Table
Rev. 15 October 2000
16-3.
Description
Description
Rx Code Af-
New Frame
0b0010
0b0110
0b0010
0b0110
ter Rx
—
If a CPU read occurs before
the new frame, new receive
code is 0010.
An empty buffer was filled
(XY was 10).
A full/overrun buffer was
filled (Y was 1).
Comment
Transmission
Successful
—
—
Code After
0b1000
0b0100
0b1010
0b1010
MOTOROLA
—
16-5