MC908AZ60ACFU Freescale Semiconductor, MC908AZ60ACFU Datasheet - Page 349
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MC908AZ60ACFU
Manufacturer Part Number
MC908AZ60ACFU
Description
IC MCU FLASH 8.4MHZ 60K 64QFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC908AZ60ACFUER.pdf
(414 pages)
Specifications of MC908AZ60ACFU
Core Processor
HC08
Core Size
8-Bit
Speed
8.4MHz
Connectivity
CAN, SCI, SPI
Peripherals
LVD, POR, PWM
Number Of I /o
52
Program Memory Size
60KB (60K x 8)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 15x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Since a logic 0 dominates a logic 1, the message with the lowest value will have the highest priority and
will always win arbitration. For instance, a message with priority 000 will win arbitration over a message
with priority 011.
This method of arbitration will work no matter how many bits of priority encoding are contained in the
message.
During arbitration, or even throughout the transmitting message, when an opposite bit is detected,
transmission is stopped immediately unless it occurs on the 8th bit of a byte. In this case, the BDLC
automatically will append up to two extra logic 1 bits and then stop transmitting. These two extra bits will
be arbitrated normally and thus will not interfere with another message. The second logic 1 bit will not be
sent if the first loses arbitration. If the BDLC has lost arbitration to another valid message, then the two
extra logic 1s will not corrupt the current message. However, if the BDLC has lost arbitration due to noise
on the bus, then the two extra logic 1s will ensure that the current message will be detected and ignored
as a noise-corrupted message.
27.5 BDLC Protocol Handler
The protocol handler is responsible for framing, arbitration, CRC generation/checking, and error
detection. The protocol handler conforms to SAE J1850 — Class B Data Communications Network
Interface.
Freescale Semiconductor
Freescale assumes that the reader is familiar with the J1850 specification
before this protocol handler description is read.
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
Figure 27-12. BDLC Block Diagram
PHYSICAL INTERFACE
PROTOCOL HANDLER
MUX INTERFACE
CPU INTERFACE
TO J1850 BUS
NOTE
TO CPU
BDLC
BDLC Protocol Handler
349
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