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參數(shù)資料
| 型號(hào)： | MC68HC705V8 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁(yè)數(shù)： | 10/28頁(yè) |
| 文件大小： | 220K |
| 代理商： | MC68HC705V8 |
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MOTOROLA
10
AN1224/D
a resistor and capacitor are required to ensure the appropriate bus loading for the node. The transceiver
design allows communication to be maintained with up to a 2-V ground offset between nodes, and also
allows the MDLC to survive a variety of fault conditions, including a short between the multiplex bus line
and V
BATT
. Refer to
Figure 3 MC68HC705V8 Power Supply and Multiplex Bus Interface Circuit
for an
example circuit for connecting the MC68HC705V8 to the multiplex bus.
NOTE
The load capacitor (C1) in this circuit should be connected between the module multiplex
bus pin and chassis ground of the module, and should be mounted as close to the module
bus pin as possible. Also, the load resistor (R1) and load capacitor should be adjusted to
provide the appropriate multiplex bus loading, depending upon the total number of nodes
connected to the multiplex bus.
MC68HC705V8 SOFTWARE ROUTINES
The example software routines in Appendix A perform three functions: initialize the MC68HC705V8 and
MDLC module for J1850 communication, transmit messages stored in MCU RAM onto the multiplex bus,
and receive, filter and store messages received from the multiplex bus into MCU RAM. The software listing
in Appendix A contains a simple program which demonstrates how each of these functions may be
performed. When a reset occurs, the MCU and MDLC will be initialized. Following this, a message will be
transmitted onto the multiplex bus which contains a three-byte header and a single data byte. Once the
message transmission is initiated, the software will enter a delay loop while the transmission takes place,
and then increment the data byte and loop back to transmit the message again. When messages are
received from the multiplex bus, the MDLC interrupt service routine will filter the messages based on the
type of message and the target address (2nd byte) of the message. Several example target I.D.s have
been selected, although the user can change, add or remove I.D.s from this list as desired. Messages
passing the filtering criteria will be stored in receive buffers in MCU RAM. Below is a brief description of
each segment of the example software and how it works. This routine uses less that 250 bytes of
programmable memory, plus 62 bytes of user RAM, although the amount of RAM required depends upon
the number of data bytes contained in each received message.
Mask Option Register
When the device is programmed, the user must also program the mask option register (MOR). This
register allows the user to enable or disable certain device features which would normally be enabled or
disabled with mask options on a ROM device.
For these software routines, the MOR byte is programmed to enable the internal voltage regulator, to
clamp the V
DD
pins to V
SS
internally when the primary voltage regulator is disabled by software, to allow
the primary voltage regulator to power up when a rising edge is detected on the BUS pin of the MDLC
module, to enable the low voltage reset (LVR) option, to disable entry into the STOP mode of operation, to
set the external interrupt request sensitivity to negative-edge only, and to enable the COP watchdog timer.
MCU Initialization
The MCU initialization routine initializes the necessary MCU registers and modules, and also initializes the
MCU RAM used by these communication routines. It should be necessary to run this routine only following
a reset of the MCU. All of the setup procedures described below can be performed by calling the
subroutine V8_RST.
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