Contents
Universal Asynchronous Receiver/Transmitter
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UART ...............................................84
UART Features .......................................................................................................84
UART External Pin Interfacing ................................................................................84
UART Data Transfer Scheme .................................................................................85
UART Status and Control Registers .......................................................................85
Baud Rate Generator ..............................................................................................91
Setting Up and Controlling the UART .....................................................................93
UART Transmitter ....................................................................................................94
UART Receiver........................................................................................................96
Managing Receiver Errors ......................................................................................98
UART Interrupt Scheme ..........................................................................................99
Address Detect Mode ...........................................................................................100
UART Operation in Power Down Mode .................................................................100
UART Sample Program .........................................................................................101
Oscillator .....................................................................................................................101
System Clock Configurations ................................................................................101
System Crystal/Ceramic Oscillator .......................................................................102
System RC Oscillator ............................................................................................102
RTC Oscillator ......................................................................................................103
Watchdog Timer Oscillator ....................................................................................104
Internal Clock Source ...........................................................................................104
Power Down Mode and Wake-up ................................................................................105
Power Down Mode ...............................................................................................105
Entering the Power Down Mode ...........................................................................105
Standby Current Considerations ...........................................................................105
Wake-up ................................................................................................................106
Low Voltage Detector
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LVD .......................................................................................107
Watchdog Timer ..........................................................................................................107
Buzzer .........................................................................................................................109
Configuration Options .................................................................................................110
Application Circuits ......................................................................................................112
Part II Programming Language ............................................................117
Chapter 2 Instruction Set Introduction .........................................................................119
Instruction Set .............................................................................................................119
Instruction Timing .................................................................................................119
Moving and Transferring Data ..............................................................................119
Arithmetic Operations ...........................................................................................120
Logical and Rotate Operations .............................................................................120
Branches and Control Transfer .............................................................................120
Bit Operations ......................................................................................................120
Table Read Operations .........................................................................................121
Other Operations ..................................................................................................121
Instruction Set Summary ............................................................................................121
Convention ...........................................................................................................121
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