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| 型號： | 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） |
| 文件頁數(shù)： | 19/28頁 |
| 文件大?。?/td> | 220K |
| 代理商： | MC68HC705V8 |
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AN1224/D
MOTOROLA
19
Appendix A
MDLCCODE.ASM Assembled with IASM 08/05/1993 04:57 PAGE 1
1 ***************************************************************************
2 * *
3 * MC68HC705V8 MDLC Module *
4 * Example Driver Software *
5 * *
6 * This software is an example of a basic software routine which *
7 * can be used with the Message Data Link Controller (MDLC) module on the *
8 * Motorola MC68HC705V8 microcontroller. This simple example program loads *
9 * a message into MCU RAM and then calls the transmit subroutine TRANSMIT *
10 * which loads the message into the MDLC module transmit buffer and then *
11 * initiates the message transmission. Once the message transmission is *
12 * initiated, the Real Time Interrupt (RTI) function on the MCU's Core *
13 * Timer is activated. If the transmission successful interrupt does not *
14 * occur before 8 RTI interrupts have occurred (about 30ms), the trans- *
15 * mission is aborted. When the transmission successful interrupt does *
16 * occur, the RTI interrupt is disabled. While waiting for the message to *
17 * complete successfully or to be aborted, the program simply waits in a *
18 * time delay loop. *
19 * This basic routine interprets received messages as either physically*
20 * addressed or functionally addressed. In J1850, a functionally addressed *
21 * message is indicated if Bit 2 of the Pri/type byte (1st byte) of the *
22 * message is clear, while for physically addressed messages, Bit 2 will *
23 * be set. No other message type determination is made, and no in-frame *
24 * response byte is (or can be) returned. *
25 * When a message is received, the MDLC interrupt service routine will *
26 * compare the target address of the received message with 4 pre-defined *
27 * message identifiers. If the target address of the message matches one *
28 * of the four, the message is retrieved and saved in a buffer reserved for*
29 * that message ID. If the target address of the received message does not *
30 * match, the message is discarded. Also, if the received message is a *
31 * physically addressed message, the target address of the received *
32 * message is compared with the assigned node address, and if it matches *
33 * the message is then retrieved and stored in a RAM buffer reserved for *
34 * physically addressed messages, along with the source address of the *
35 * message originator. *
36 * Though simple, this software demonstrates all of the basic features *
37 * of the MDLC module, and how they can be used for performing communi- *
38 * cation across a J1850-compatible multiplex bus. *
39 * *
40 * Revision History *
41 * *
42 * Rev 0.1 (initial release) Chuck Powers 5/03/93 *
43 * Rev 0.2 Updated transfer routines *
44 * between MCU RAM and the *
45 * MDLC transmit and receive *
46 * buffers. Chuck Powers 7/08/93 *
47 * Rev 0.3 Added initialization of *
48 * MISC register Chuck Powers 8/05/93 *
49 * *
50 ***************************************************************************
51
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