Manual

High-Speed Microcontroller User’s Guide
Rev: 062210 6 of 176
12.5 FRAMING ERROR DETECTION ...................................................................................................149
12.6 MULTIPROCESSOR COMMUNICATION ........................................................................................151
13. TIMED-ACCESS PROTECTION .................................................................................153
13.1 PROTECTED BITS.....................................................................................................................153
13.2 PROTECTION SCHEME..............................................................................................................153
13.3 TIMED-ACCESS PROTECTS WATCHDOG....................................................................................154
14. REAL-TIME CLOCK....................................................................................................156
14.1 STARTING AND STOPPING THE RTC..........................................................................................157
14.2 SETTING AND READING THE RTC TIME REGISTERS...................................................................157
14.3 USING THE RTC ALARM ...........................................................................................................158
14.4 USING THE DAY OF THE WEEK BITS ..........................................................................................159
14.5 CHOOSING AN RTC CRYSTAL...................................................................................................159
14.6 CALIBRATING THE RTC OSCILLATOR ........................................................................................160
15. BATTERY BACKUP....................................................................................................161
15.1 SELECTING A BATTERY.............................................................................................................161
15.2 LITHIUM BATTERY CONSIDERATIONS.........................................................................................162
16. INSTRUCTION SET DETAILS ....................................................................................163
17. TROUBLESHOOTING
.................................................................................................172
17.1 DEVICE OPERATES AT ONE-THIRD THE CRYSTAL SPEED...........................................................172
17.2 DEVICE RESETS FOR NO REASON ............................................................................................172
17.3 ACCESS TO INTERNAL MOVX SRAM IS UNSUCCESSFUL...........................................................172
17.4 REAL-TIME CLOCK DOES NOT OPERATE OR KEEP ACCURATE TIME...........................................172
17.5 SERIAL PORT DOES NOT WORK ...............................................................................................173
17.6 HIGH-SPEED MICROCONTROLLER DOES NOT WORK IN EXISTING 8051 DESIGN.........................173
18. MICROCONTROLLER DEVELOPMENT SUPPORT..................................................174
18.1 TECHNICAL SUPPORT...............................................................................................................174
18.2 DEVELOPMENT TOOLS .............................................................................................................174
18.3 SOFTWARE COMPATIBILITY ......................................................................................................174
18.4 HIGH-LEVEL LANGUAGE COMPILERS.........................................................................................174
19. REVISION HISTORY...................................................................................................176