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4.5.2.5.7 Caution about use of timer counters 0 and 1 ..................................90
4.5.2.5.8 Caution about use of timer counters 0 and 1 when setting software
power down mode...........................................................................91
4.5.3 Timer/counter 2 .........................................................................................92
4.5.3.1 Outline ...................................................................................................92
4.5.3.2 Timer 2 control register (T2CON) ..........................................................92
4.5.3.3 Timer/counter 2 operation modes..........................................................93
4.5.3.3.1 16-bit auto reload mode ..................................................................93
4.5.3.3.2 16-bit capture mode ........................................................................94
4.5.3.3.3 16-bit baud rate generator mode ....................................................95
4.5.3.4 Timer/counter 2 detector circuit .............................................................97
4.5.3.4.1 T2(timer/counter 2 external clock detector) ....................................97
4.5.3.4.2 T2EX(timer/counter 2 external flag input detector) .........................97
4.5.3.5 Timer/counter carry signal detector circuit.............................................98
4.6 Serial Port .........................................................................................................99
4.6.1 Outline .......................................................................................................99
4.6.2 Special function registers for serial port ..................................................101
4.6.2.1 SCON ..................................................................................................101
4.6.2.2 SBUF ...................................................................................................103
4.6.2.3 TCLK ...................................................................................................103
4.6.2.4 RCLK ...................................................................................................103
4.6.2.5 SMOD ..................................................................................................104
4.6.2.6 SERR ..................................................................................................105
4.6.3 Operating modes .....................................................................................106
4.6.3.1 Mode 0.................................................................................................106
4.6.3.1.1 Outline...........................................................................................106
4.6.3.1.2 Mode 0 baud rate ..........................................................................106
4.6.3.1.3 Mode 0 transmit operation ............................................................106
4.6.3.1.4 Mode 0 receive operation .............................................................106
4.6.3.2 Mode 1 ..................................................................................................110
4.6.3.2.1 Outline...........................................................................................110
4.6.3.2.2 Mode 1 baud rate ..........................................................................110
4.6.3.2.3 Mode 1 transmit operation ............................................................111
4.6.3.2.4 Mode 1 receive operation .............................................................111
4.6.3.2.5 Mode 1 UART error detection .......................................................112
4.6.3.3 Mode 2.................................................................................................115
4.6.3.3.1 Outline...........................................................................................115
4.6.3.3.2 Mode 2 baud rate ..........................................................................115
4.6.3.3.3 Mode 2 transmit operation ............................................................115
4.6.3.3.4 Mode 2 receive operation .............................................................115
4.6.3.3.5 Mode 2 UART error detection .......................................................116
4.6.3.4 Mode 3.................................................................................................119
4.6.3.4.1 Outline...........................................................................................119
4.6.3.4.2 Mode 3 baud rate ..........................................................................119
4.6.3.4.3 Mode 3 transmit operation ............................................................120
4.6.3.4.4 Mode 3 receive operation. ............................................................120
4.6.3.4.5 Mode 3 UART error detection .......................................................121
4.6.4 Serial port application examples..............................................................124
4.6.4.1 I/O extension .......................................................................................124