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CONTENTS
vii
10.2 MODES OF OPERATION............................................................................................ 10-4
10.2.1 Synchronous Mode (Mode 0) ..................................................................................10-4
10.2.1.1 Transmission (Mode 0) ......................................................................................10-4
10.2.1.2 Reception (Mode 0) ............................................................................................10-5
10.2.2 Asynchronous Modes (Modes 1, 2, and 3) .............................................................10-6
10.2.2.1 Transmission (Modes 1, 2, 3) .............................................................................10-6
10.2.2.2 Reception (Modes 1, 2, 3) ..................................................................................10-6
10.3 FRAMING BIT ERROR DETECTION (MODES 1, 2, AND 3)...................................... 10-7
10.4 MULTIPROCESSOR COMMUNICATION (MODES 2 AND 3).................................... 10-7
10.5 AUTOMATIC ADDRESS RECOGNITION................................................................... 10-7
10.5.1 Given Address ........................................................................................................10-8
10.5.2 Broadcast Address ..................................................................................................10-9
10.5.3 Reset Addresses ...................................................................................................10-10
10.6 BAUD RATES............................................................................................................ 10-10
10.6.1 Baud Rate for Mode 0 ...........................................................................................10-10
10.6.2 Baud Rates for Mode 2 .........................................................................................10-10
10.6.3 Baud Rates for Modes 1 and 3 .............................................................................10-10
10.6.3.1 Timer 1 Generated Baud Rates (Modes 1 and 3) ............................................10-11
10.6.3.2 Selecting Timer 1 as the Baud Rate Generator ...............................................10-11
10.6.3.3 Timer 2 Generated Baud Rates (Modes 1 and 3) ............................................10-12
10.6.3.4 Selecting Timer 2 as the Baud Rate Generator ...............................................10-12
CHAPTER 11
MINIMUM HARDWARE SETUP
11.1 MINIMUM HARDWARE SETUP.................................................................................. 11-1
11.2 ELECTRICAL ENVIRONMENT................................................................................... 11-2
11.2.1 Power and Ground Pins ..........................................................................................11-2
11.2.2 Unused Pins ............................................................................................................11-2
11.2.3 Noise Considerations ..............................................................................................11-2
11.3 CLOCK SOURCES...................................................................................................... 11-3
11.3.1 On-chip Oscillator (Crystal) .....................................................................................11-3
11.3.2 On-chip Oscillator (Ceramic Resonator) .................................................................11-4
11.3.3 External Clock .........................................................................................................11-4
11.4 RESET......................................................................................................................... 11-5
11.4.1 Externally Initiated Resets ......................................................................................11-6
11.4.2 WDT Initiated Resets ..............................................................................................11-6
11.4.3 Reset Operation ......................................................................................................11-6
11.4.4 Power-on Reset ......................................................................................................11-7
CHAPTER 12
SPECIAL OPERATING MODES
12.1 GENERAL.................................................................................................................... 12-1
12.2 POWER CONTROL REGISTER ................................................................................. 12-1
12.2.1 Serial I/O Control Bits .............................................................................................12-1