參數(shù)資料
型號: HC05V7GRS
英文描述: 68HC05V7 General Release Specification
中文描述: 68HC05V7一般版本規(guī)范
文件頁數(shù): 137/170頁
文件大?。?/td> 980K
代理商: HC05V7GRS
SECTION 15: MESSAGE DATA LINK CONTROLLER
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
Page 123
15.6
MDLC PHYSICAL INTERFACE
All analog functions involved in transmitting and receiving from the J1850 bus are
performed by the Physical Interface. The Physical Interface serves to buffer the incoming
messages, wave-shape the messages being transmitted, and protect the MDLC from
transients occurring on the J1850 bus.
15.6.1
OUTLINE
The receiver analog comparator and transmitter drivers are included in the MDLC Physical
Interface and together are referred to as the "transceiver".
The transceiver provides a waveshaped 7V bus waveform in response to a timed logic
signal from the MUX Interface. The transceiver actively drives the bus high, and passively
lets an RC network pull the bus low. In order to achieve the 7V level necessary for the bus
signal, the transceiver uses a battery supply (V
BATT
) which is nominally 12V. The
transceiver also receives bus waveforms and provides the MUX Interface with unfiltered
input data
A low power mode of operation is automatically entered if the CPU executes a STOP or
WAIT instruction.
In the event that ground is lost, the transceiver senses this condition and releases the bus
by switching the LOAD pin to a high impedance instead of a low impedance to ground.The
transceiver also protects the MDLC by not passing on any standard disruptive or non-
disruptive signals seen on the bus to the rest of the MDLC.
The Physical Interface contains its own power-on reset circuit that is used to reset its
control circuitry whenever a power-on condition is detected.
Physical Interface
To CPU
Protocol Handler
MUX Interface
CPU Interface
Rx/Tx
To J1850 Bus
MDLC
F
Freescale Semiconductor, Inc.
n
.
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