MC68HC912B32VFU8 Freescale Semiconductor, MC68HC912B32VFU8 Datasheet - Page 225
MC68HC912B32VFU8
Manufacturer Part Number
MC68HC912B32VFU8
Description
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68HC912B32VFU8.pdf
(334 pages)
Specifications of MC68HC912B32VFU8
Cpu Family
HC12
Device Core Size
16b
Frequency (max)
8MHz
Interface Type
SCI/SPI
Program Memory Type
EPROM
Program Memory Size
32KB
Total Internal Ram Size
1KB
# I/os (max)
63
Operating Supply Voltage (typ)
5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
4.5V
On-chip Adc
8-chx10-bit
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 105C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
80
Package Type
PQFP
Lead Free Status / Rohs Status
Not Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MC68HC912B32VFU8
Manufacturer:
MOTOROLA/摩托罗拉
Quantity:
20 000
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15.7.4.5 Valid EOF and IFS Symbols
In
message occurs between A and B, the current symbol is considered a valid end-of-frame (EOF) symbol.
See
message occurs between C and D, the current symbol is considered a valid EOF symbol followed by a
valid inter-frame separation symbol (IFS). All nodes must wait until a valid IFS symbol time has expired
before beginning transmission. However, due to variations in clock frequencies and bus loading, some
nodes may recognize a valid IFS symbol before others and immediately begin transmitting. Therefore,
any time a node waiting to transmit detects a passive-to-active transition once a valid EOF has been
detected, it should immediately begin transmission, initiating the arbitration process.
15.7.4.6 Idle Bus
In
of the next message does not occur before D, the bus is considered to be idle, and any node wishing to
transmit a message may do so immediately.
Freescale Semiconductor
Figure
Figure
Figure
15-7(1), if the passive-to-active received transition beginning the SOF symbol of the next
15-7(2), if the passive-to-active received transition beginning the start-of-frame (SOF) symbol
15-7(2). If the passive-to-active received transition beginning the SOF symbol of the next
ACTIVE
PASSIVE
ACTIVE
PASSIVE
Figure 15-7. VPW Received Passive EOF and IFS Symbol Times
280 µs
M68HC12B Family Data Sheet, Rev. 9.1
300 µs
A
B
C
D
(1) VALID EOF SYMBOL
(2) VALID EOF+
IFS SYMBOL
BDLC MUX Interface
225
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