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3.3.4
Register addressing ......................................................................................................................50
3.4
Operand Address Addressing...................................................................................................51
3.4.1
Direct addressing ..........................................................................................................................51
3.4.2
Short direct addressing .................................................................................................................52
3.4.3
Special function register (SFR) addressing...................................................................................53
3.4.4
Register addressing ......................................................................................................................54
3.4.5
Register indirect addressing..........................................................................................................55
3.4.6
Based addressing .........................................................................................................................56
3.4.7
Stack addressing...........................................................................................................................56
PORT FUNCTIONS...........................................................................................................57
4.1
Port Functions ............................................................................................................................57
4.2
Port Configuration......................................................................................................................59
4.2.1
Port 0.............................................................................................................................................60
4.2.2
Port 1.............................................................................................................................................61
4.2.3
Port 2.............................................................................................................................................62
4.2.4
Port 4.............................................................................................................................................68
4.3
Registers Controlling Port Function ........................................................................................69
4.4
Port Function Operation ............................................................................................................72
4.4.1
Writing to I/O port ..........................................................................................................................72
4.4.2
Reading from I/O port....................................................................................................................72
4.4.3
Arithmetic operation of I/O port .....................................................................................................72
CLOCK GENERATOR......................................................................................................73
5.1
Clock Generator Functions .......................................................................................................73
5.2
Clock Generator Configuration.................................................................................................73
5.3
Register Controlling Clock Generator......................................................................................74
5.4
System Clock Oscillators ..........................................................................................................75
5.4.1
System clock oscillator..................................................................................................................75
5.4.2
Examples of incorrect resonator connection .................................................................................76
5.4.3
Frequency divider..........................................................................................................................77
5.5
Clock Generator Operation........................................................................................................77
5.6
Changing Setting of CPU Clock................................................................................................78
5.6.1
Time required for switching CPU clock .........................................................................................78
5.6.2
Switching CPU clock .....................................................................................................................78
CHAPTER 6
8-BIT TIMER/EVENT COUNTERS 00 AND 01 ............................................................79
6.1
Functions of 8-Bit Timer/Event Counters 00 and 01 ...............................................................79
6.2
Configuration of 8-Bit Timer/Event Counters 00 and 01.........................................................80
6.3
Registers Controlling 8-Bit Timer/Event Counters 00 and 01 ................................................82
6.4
Operation of 8-Bit Timer/Event Counters 00 and 01 ...............................................................85
6.4.1
Operation as interval timer ............................................................................................................85
6.4.2
Operation as external event counter (timer 01 only) .....................................................................87
6.4.3
Operation as square-wave output (timer 01 only) .........................................................................88
6.5
Notes on Using 8-Bit Timer/Event Counters 00 and 01 ..........................................................90
User's Manual U12978EJ3V0UD
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