NEC 78K0 User Manual page 11

3.3.2 Immediate addressing ....................................................................................................................64
3.3.3 Table indirect addressing ...............................................................................................................65
3.3.4 Register addressing........................................................................................................................65
3.4 Operand Address Addressing .................................................................................................. 66
3.4.1 Implied addressing .........................................................................................................................66
3.4.2 Register addressing........................................................................................................................67
3.4.3 Direct addressing............................................................................................................................68
3.4.4 Short direct addressing...................................................................................................................69
3.4.5 Special function register (SFR) addressing ....................................................................................70
3.4.6 Register indirect addressing ...........................................................................................................71
3.4.7 Based addressing...........................................................................................................................72
3.4.8 Based indexed addressing .............................................................................................................73
3.4.9 Stack addressing ............................................................................................................................74
CHAPTER 4 PORT FUNCTIONS........................................................................................................... 75
4.1 Port Functions............................................................................................................................ 75
4.2 Port Configuration ..................................................................................................................... 77
4.2.1 Port 0..............................................................................................................................................78
4.2.2 Port 1..............................................................................................................................................80
4.2.3 Port 2..............................................................................................................................................85
4.2.4 Port 3..............................................................................................................................................86
4.2.5 Port 6..............................................................................................................................................88
4.2.6 Port 7..............................................................................................................................................89
4.2.7 Port 12............................................................................................................................................90
4.2.8 Port 13............................................................................................................................................91
4.3 Registers Controlling Port Function........................................................................................ 92
4.4 Port Function Operations.......................................................................................................... 96
4.4.1 Writing to I/O port ...........................................................................................................................96
4.4.2 Reading from I/O port .....................................................................................................................96
4.4.3 Operations on I/O port ....................................................................................................................96
CHAPTER 5 CLOCK GENERATOR ...................................................................................................... 97
5.1 Functions of Clock Generator .................................................................................................. 97
5.2 Configuration of Clock Generator............................................................................................ 97
5.3 Registers Controlling Clock Generator ................................................................................... 99
5.4 System Clock Oscillator.......................................................................................................... 106
5.4.1 X1 oscillator ..................................................................................................................................106
5.4.2 Subsystem clock oscillator............................................................................................................106
5.4.3 When subsystem clock is not used...............................................................................................109
5.4.4 Ring-OSC oscillator ......................................................................................................................109
5.4.5 Prescaler ......................................................................................................................................109
5.5 Clock Generator Operation ..................................................................................................... 110
5.6 Time Required to Switch Between Ring-OSC Clock and X1 Input Clock .......................... 117
5.7 Time Required for CPU Clock Switchover ............................................................................ 118
5.8 Clock Switching Flowchart and Register Setting ................................................................. 119
5.8.1 Switching from Ring-OSC clock to X1 input clock ........................................................................119
5.8.2 Switching from X1 input clock to Ring-OSC clock ........................................................................120
5.8.3 Switching from X1 input clock to subsystem clock........................................................................121
User's Manual U16227EJ2V0UD
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