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): 23/28頁(yè)
文件大小: 220K
代理商: MC68HC705V8
AN1224/D
MOTOROLA
23
245 ***************************************************************************
246 ***** MCU Initialization Routine *****
247 ***************************************************************************
248
249 *************************************************************************
250 * This subroutine initializes all of the MCU modules and RAM locations *
251 * used in this example routine. This includes the MISC register, the *
252 * MDLC module, the Core Timer, the node address, and the RTI counter. *
253 * The COP Watchdog is then kicked for good luck! *
254 *************************************************************************
255
2000 256 org sub
257
2000 [02] 9B 258 v8_rst: sei ;To reset the MCU, JSR to here
259
260 *** Initialize Miscellaneous for Voltage Regulator Operation ***
261
2001 [02] A601 262 lda #%00000001 ;Output Compare disabled,
2003 [04] B72F 263 sta misc ;Primary voltage regulator enabled
264
265 *** Initialize MDLC for J1850 Comm. ***
266
2005 [02] A62E 267 lda #%00101110 ;B7-rxbm, B6-txab, B5:4-Rate Select
2007 [04] B70E 268 sta mcr ;B1-Interrupt Enable, B0-Wait Clock Mode
269 ;Also, MTST1:0=1 for EVS
270
271 *** Initialize Core Timer ***
272
2009 [02] A602 273 lda #%00000010 ;Initialize the Core Timer for using
200B [04] B708 274 sta ctcsr ;the RTI for timing transmissions
275
276 *** Initialize 05V8 Node Address ***
277
200D [02] A677 278 lda #node ;Store the node address into
200F [04] B745 279 sta source ;the correct location in the RAM
280 ;Transmit buffer
281 *** Clear RTI Counter ***
282
2011 [05] 3F41 283 clr rticnt ;Clear RTI counter, just to make sure
284 ;it begins life=0
285
286 *** Initialization of Receive Message Buffer Pointers ***
287
2013 [02] A65E 288 lda #buff1 ;Load location of message buffer w/id1
2015 [04] B75A 289 sta fmsg1 ;in message buffer pointer fmsg1
290
2017 [02] A666 291 lda #buff2 ;Load location of message buffer w/id2
2019 [04] B75B 292 sta fmsg2 ;in message buffer pointer fmsg2
293
201B [02] A66E 294 lda #buff3 ;Load location of message buffer w/id3
201D [04] B75C 295 sta fmsg3 ;in message buffer pointer fmsg3
296
201F [02] A676 297 lda #buff4 ;Load location of message buffer w/id4
2021 [04] B75D 298 sta fmsg4 ;in message buffer pointer fmsg4
299
300 *** Kick Watchdog ***
301
2023 [02] A600 302 lda #$00 ;Load $00 into COPR to kick
2025 [05] C73FF0 303 sta copr ;the COP watchdog
304
2028 [02] 9A 305 cli ;Clear I-bit, enabling interrupts
306
2029 [06] 81 307 rts ;Return from Reset subroutine
308
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