MC68HC705X32CFU Freescale Semiconductor, MC68HC705X32CFU Datasheet - Page 63

• Manufacturer Part Number: MC68HC705X32CFU
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC705X32CFU

• Cpu Family: HC05
• Device Core Size: 8b
• Frequency (max): 4MHz
• Interface Type: SCI
• Program Memory Type: EPROM
• Program Memory Size: 32KB
• Total Internal Ram Size: 528Byte
• # I/os (max): 32
• Number Of Timers - General Purpose: 1
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• On-chip Adc: 8-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 64
• Package Type: PQFP
• Lead Free Status / Rohs Status: Supplier Unconfirmed

The MCAN includes all hardware modules necessary to implement the CAN transfer layer, which
represents the kernel of the CAN bus protocol as defined by BOSCH GmbH, the originators of the
CAN specification. For full details of the CAN protocol please refer to the published specifications.
Up to the message level, the MCAN is totally compatible with the full CAN implementation.
Functional differences are related to the object layer only. Whereas a full CAN controller provides
dedicated hardware for handling a set of messages, the MCAN is restricted to receiving and/or
transmitting messages on a message by message basis.
The MCAN will never initiate an overload frame. If the MCAN starts to receive a valid message
(one that passes the acceptance filter) and there is no receive buffer available for it then the
overrun flag in the CPU status register will be set. The MCAN will respond to overload frames
generated by other CAN nodes, as required by the CAN protocol. A summary of all the MCAN
frame formats is given in
shown in
MC68HC05X16
Figure
MOTOROLA CAN MODULE (MCAN)
Microprocessor related logic
Freescale Semiconductor, Inc.
5-1.
management
Interface
For More Information On This Product,
Transmit
Receive
Receive
buffer 0
buffer 1
logic
buffer
Figure 5-2
MOTOROLA CAN MODULE (MCAN)
Go to: www.freescale.com
Figure 5-1 MCAN block diagram
for reference. A diagram of the major blocks of the MCAN is
5
management
Error
logic
Bus line related logic
Transceive
Bit stream
processor
Bit timing
logic
logic
interface
logic
Line
MCAN
bus
line
5-1
5