MC81F4204
April 24, 2012 Ver.1.41 7
9.2 Program Memory ........................................................................................................................48
9.3 Data Memory ..............................................................................................................................51
9.4 User Memory ..............................................................................................................................51
9.5 Stack Area ..................................................................................................................................52
9.6 Control Registers ( SFR ) ...........................................................................................................52
9.7 Addressing modes ...................................................................................................................... 57
10. I/O PORTS ......................................................................................................................................64
10.1 R0 Port Registers .....................................................................................................................65
10.2 R1 Port Registers .....................................................................................................................69
10.3 R3 Port Registers .....................................................................................................................73
11. INTERRUTP CONTROLLER..........................................................................................................75
11.1 Registers...................................................................................................................................76
11.2 Interrupt Sequence ...................................................................................................................78
11.3 BRK Interrupt ............................................................................................................................81
11.4 Shared Interrupt Vector ............................................................................................................81
11.5 Multi Interrupt............................................................................................................................82
11.6 Interrupt Vector & Priority Table ...............................................................................................83
12. EXTERNAL INTERRUPTS .............................................................................................................84
12.1 Registers...................................................................................................................................84
12.2 Procedure .................................................................................................................................87
13. OSCILLATION CIRCUITS ..............................................................................................................88
13.1 Main Oscillation Circuits ...........................................................................................................88
13.2 PCB Layout...............................................................................................................................89
14. BASIC INTERVAL TIMER ..............................................................................................................90
14.1 Registers...................................................................................................................................91
15. WATCH DOG TIMER......................................................................................................................93
15.1 Registers...................................................................................................................................94
16. Timer 0/1 .........................................................................................................................................95
16.1 Registers...................................................................................................................................95
16.2 Timer 0 8-Bit Mode ...................................................................................................................99
16.3 Timer 1 8-Bit Mode .................................................................................................................101
17. Timer 2 ..........................................................................................................................................103
17.1 Registers.................................................................................................................................103
17.2 Timer 2 8-Bit Mode .................................................................................................................105
18. High Speed PWM..........................................................................................................................107
18.1 Registers.................................................................................................................................109
19. BUZZER........................................................................................................................................111
19.1 Registers.................................................................................................................................112
19.2 Frequency table ......................................................................................................................113
20. 12-BIT ADC...................................................................................................................................115
20.1 Registers.................................................................................................................................116
20.2 Procedure ...............................................................................................................................117
20.3 Conversion Timing..................................................................................................................117
20.4 Internal Reference Voltage Levels .........................................................................................118
20.5 Recommended Circuit ............................................................................................................118
21. SERIAL I/O INTERFACE ..............................................................................................................119
21.1 Registers.................................................................................................................................120
21.2 Procedure ...............................................................................................................................121
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