Zilog Z16C35 Bedienungsanleitung PDF herunterladen (Seite 296)

Application Note

Technical Considerations When Implementing LocalTalk Link Access Protocol

14-8

LISTING 4

1306

1307 ;****************************************

1308 ;ctc1 timer int handler

1309 ;****************************************

00000509 1310 ctc1int:

1311 ;ctc1 is programmed in counter mode.

1312 ;external trigger edges is provided by

1313 ;/trxc pin at intervals of 4.3 usec.

1314 ;bit1 of timﬂg is set when count is terminated.

00000509 f5 1315 push af

0000050a c5 1316 push bc

0000050b e5 1317 push hl

1318 ;** update the timing ﬂag **

0000050c 21Wwww 1319 ld hl,timﬂg

0000050f 7e 1320 ld a,(hl) ;get recent timﬂg

00000510 cbcf 1321 set 1,a ;bit1=1 after count is over

00000512 77 1322 ld (hl),a ;update the timﬂg

00000513 e1 1323 pop hl

00000514 c1 1324 pop bc

00000515 f1 1325 pop af

00000516 fb 1326 ei

00000517 ed4d 1327 reti

1328

1329

1330

1331 ;**********************************

1332 ;interrupt vector table for the scc

1333 ;**********************************

1334 ;the status of the interrupt source will affect

1335 ;the interrupt vector. The interrupt handler’s

1336 ;address are set in a block, as below.

00000a00 1337 org sdlc + 0a00h

00000a00 1338 sccvect:

1339 if scc_a

00000a00 1340 .block 8 ;reserve vector for other ch

1341 endif

00000a08 R000+03e9, 1342 dw txint ;tx int

00000a0a R000+04c8, 1343 dw ext_stat ;ext/stat int

00000a0c R000+0433, 1344 dw recint ;rx char int

00000a0e R000+0454, 1345 dw spcond ;sp rec cond int

1346

1347 if not scc_a

00000a10 1348 .block 8 ;reserve vector for other ch

1349 endif

1350

00000a18 1351 temp: .block 1

1352

1353

1354 ;**********************************

1355 ;interrupt vector table for the ctc

1356 ;**********************************

00000ad0 1357 org 0ad0h

00000ad0 R000+04d8, 1358 dw ctc0int ;reserved for ctc0 int routine

00000ad2 1359 org 0ad2h

00000ad2 R000+0509, 1360 dw ctc1int ;reserved for ctc1 int routine

1361

1362 ;************************

1363 ;receive buffer area

1364 ;************************

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