Maxim Integrated High-Speed Microcontroller - Manual (Page 6)

High-Speed Microcontroller User’s Guide
Rev: 062210 6 of 176
12.5 F RAMING E RROR D ETECTION ...................................................................................................149
12.6 M ULTIPROCESSOR C OMMUNICATION ........................................................................................151
13. TIMED-ACCESS PROTECTION .................................................................................153
13.1 P ROTECTED B ITS .....................................................................................................................153
13.2 P ROTECTION S CHEME ..............................................................................................................153
13.3 T IMED -A CCESS P ROTECTS W ATCHDOG ....................................................................................154
14. REAL-TIME CLOCK....................................................................................................156
14.1 S TARTING AND S TOPPING THE RTC..........................................................................................157
14.2 S ETTING AND R EADING THE RTC T IME R EGISTERS ...................................................................157
14.3 U SING THE RTC A LARM ...........................................................................................................158
14.4 U SING THE D AY OF THE W EEK B ITS ..........................................................................................159
14.5 C HOOSING AN RTC C RYSTAL ...................................................................................................159
14.6 C ALIBRATING THE RTC O SCILLATOR ........................................................................................160
15. BATTERY BACKUP....................................................................................................161
15.1 S ELECTING A B ATTERY .............................................................................................................161
15.2 L ITHIUM B ATTERY C ONSIDERATIONS .........................................................................................162
16. INSTRUCTION SET DETAILS ....................................................................................163
17. TROUBLESHOOTING.................................................................................................172
17.1 D EVICE O PERATES AT O NE -T HIRD THE C RYSTAL S PEED ...........................................................172
17.2 D EVICE R ESETS FOR N O R EASON ............................................................................................172
17.3 A CCESS TO I NTERNAL MOVX SRAM I S U NSUCCESSFUL ...........................................................172
17.4 R EAL -T IME C LOCK D OES N OT O PERATE OR K EEP A CCURATE T IME ........................................... 172
17.5 S ERIAL P ORT D OES N OT W ORK ...............................................................................................173
17.6 H IGH -S PEED M ICROCONTROLLER D OES N OT W ORK IN E XISTING 8051 D ESIGN ......................... 173
18. MICROCONTROLLER DEVELOPMENT SUPPORT..................................................174
18.1 T ECHNICAL S UPPORT ...............................................................................................................174
18.2 D EVELOPMENT T OOLS .............................................................................................................174
18.3 S OFTWARE C OMPATIBILITY ......................................................................................................174
18.4 H IGH -L EVEL L ANGUAGE C OMPILERS .........................................................................................174
19. REVISION HISTORY ...................................................................................................176