MC68F375BGMZP33 Freescale Semiconductor, MC68F375BGMZP33 Datasheet - Page 319

• Manufacturer Part Number: MC68F375BGMZP33
• Description: IC MPU 32BIT 33MHZ 217-PBGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68F375BGMZP33

• Processor Type: M683xx 32-Bit
• Speed: 33MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 217-PBGA
• Processor Series: M683xx
• Core: CPU32
• Data Bus Width: 32 bit
• Program Memory Type: Flash
• Program Memory Size: 256 KB
• Data Ram Size: 10 KB
• Interface Type: SPI, SCI, CAN
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 48
• Number Of Timers: 16
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 16 Channel
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Lead Free Status / Rohs Status: No

7.5.3.1 Transmit Message Buffer Deactivation
7.5.3.2 Reception of Transmitted Frames
7.5.4 Receive Process
MC68F375
REFERENCE MANUAL
transmission, this internal arbitration process selects the message buffer from which
the next frame is transmitted.
When this process is over and a message buffer is selected for transmission, the
frame from that message buffer is transferred to the serial message buffer for
transmission.
The TouCAN transmit s no more than eight data bytes, even if the transmit length con-
tains a value greater than eight.
At the end of a successful transmission, the value of the free-running timer (which was
captured at the beginning of the identifier field on the CAN bus), is written into the time
stamp field in the message buffer. The code field in the control/status word of the mes-
sage buffer is updated and a status flag is set in the IFLAG register.
Any write access to the control/status word of a transmit message buffer during the
process of selecting a message buffer for transmission immediately deactivates that
message buffer, removing it from the transmission process.
If the user deactivates a transmit message buffer while a message is being transferred
from it to a serial message buffer, the message is not transmitted.
If the user deactivates the transmit message buffer after the message is transferred to
the serial message buffer, the message is transmitted, but no interrupt is requested,
and the transmit code is not updated.
If a message buffer containing the lowest ID is deactivated while that message is
undergoing the internal arbitration process to determine which message should be
sent, then that message may not be transmitted.
The TouCAN receives a frame it has transmitted if an empty message buffer with a
matching identifier exists.
During the receive process, the following events occur:
The user should prepare or change a message buffer for frame reception by executing
the following steps.
• The user configures the message buffers for reception.
• The TouCAN transfers received messages from the serial message buffers to the
• The user retrieves these messages.
1. Write the control/status word to hold the receive buffer inactive (code =
2. Write the ID_HIGH and ID_LOW words.
receive message buffers with matching IDs.
0b0000).
Freescale Semiconductor, Inc.
For More Information On This Product,
CAN 2.0B CONTROLLER MODULE
Go to: www.freescale.com
Rev. 25 June 03
MOTOROLA
7-13