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參數(shù)資料
| 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)： | 25/28頁 |
| 文件大小： | 220K |
| 代理商： | MC68HC705V8 |
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AN1224/D
MOTOROLA
25
380
1303 [03] CC1358 381 jmp txint ;Otherwise, go to transmit interrupt
382 ;service routine
383
384 *** Receive Message Successful Interrupt Handling Routine ***
385
1306 [05] 05341C 386 rxint: brclr type,rxdata0,funct ;Is Bit 2 of the Pri/Type byte
387 ;of the message set, indicating
388 ;a physically addressed message
389
1309 [03] B635 390 lda rxdata1 ;If physically addressed,
391 ;load Target Address into Acc.
392
130B [02] A177 393 cmp #node ;Does it match my Node Address
394
130D [03] 2647 395 bne rxdone ;If not, ignore message and release Rx buffer
396
130F [03] B611 397 lda mrsr ;Otherwise, load received message
398 ;byte count into Acc.
399
1311 [02] A003 400 sub #$03 ;Subtract $03 for correct # of data bytes
401
1313 [04] B750 402 sta ncount ;Then store in N-N message byte count storage
403
1315 [02] 97 404 tax ;Also store # of data byte in X-register
405
1316 [03] 5A 406 nextn: decx ;Then decrement X, for correct offset
407 ;for indexed transfer of data from the
408 ;MDLC Rx buffer to the Node-Node RAM buffer
409
1317 [04] E637 410 lda rxdata3,x ;Move next data byte (last byte first) from
1319 [05] E752 411 sta nbuff,x ;MDLC Rx buffer into Node-Node RAM buffer
412
131B [03] 5D 413 tstx ;Test the X-Register to see if it is 0
414
131C [03] 26F8 415 bne nextn ;If X<>0, indicating the last byte has not
416 ;been transferred, then go get the next byte
417
131E [03] B636 418 lda rxdata2 ;Load Source Address of receive message
1320 [04] B751 419 sta nsource ;into RAM location NSOURCE
420
1322 [03] CC1356 421 jmp rxdone ;Then go release the Rx buffer and finish up
422
1325 [03] 5F 423 funct: clrx ;Clear Index Register
424
1326 [03] B635 425 lda rxdata1 ;Compare target address of received
1328 [02] A11A 426 cmp #id1 ;message with ID#1
427
132A [03] 2712 428 beq get_msg ;If it matches, go get message
429
132C [03] 5C 430 incx ;Otherwise increment X-register, and then...
431
132D [02] A120 432 cmp #id2 ;Compare target address with ID#2
433
132F [03] 270D 434 beq get_msg ;If it matches, go get message
435
1331 [03] 5C 436 incx ;Otherwise increment X-register, and then...
437
1332 [02] A15E 438 cmp #id3 ;Compare target address with ID#3
439
1334 [03] 2708 440 beq get_msg ;If it matches, go get message
441
1336 [03] 5C 442 incx ;Otherwise increment X-register, and then...
443
1337 [02] A1D3 444 cmp #id4 ;Compare target address with ID#4
445
1339 [03] 2703 446 beq get_msg ;If it matches, go get message
447
133B [03] CC1356 448 jmp rxdone ;If not, go release Rx buffer,
449 ;discarding the received message
450
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