NEC 78K0 User Manual page 13

3.2 Processor Registers................................................................................................................. 74
3.2.1 Control registers............................................................................................................................74
3.2.2 General-purpose registers ............................................................................................................78
3.2.3 Special function registers (SFRs)..................................................................................................79
3.3 Instruction Address Addressing............................................................................................. 84
3.3.1 Relative addressing.......................................................................................................................84
3.3.2 Immediate addressing...................................................................................................................85
3.3.3 Table indirect addressing ..............................................................................................................86
3.3.4 Register addressing ......................................................................................................................86
3.4 Operand Address Addressing................................................................................................. 87
3.4.1 Implied addressing ........................................................................................................................87
3.4.2 Register addressing ......................................................................................................................88
3.4.3 Direct addressing ..........................................................................................................................89
3.4.4 Short direct addressing .................................................................................................................90
3.4.5 Special function register (SFR) addressing...................................................................................91
3.4.6 Register indirect addressing..........................................................................................................92
3.4.7 Based addressing .........................................................................................................................93
3.4.8 Based indexed addressing............................................................................................................94
3.4.9 Stack addressing...........................................................................................................................95
CHAPTER 4 PORT FUNCTIONS........................................................................................................... 96
4.1 Port Functions .......................................................................................................................... 96
4.2 Port Configuration .................................................................................................................... 98
4.2.1 Port 0 ............................................................................................................................................99
4.2.2 Port 1 ..........................................................................................................................................103
4.2.3 Port 2 ..........................................................................................................................................108
4.2.4 Port 3 ..........................................................................................................................................109
4.2.5 Port 4 ..........................................................................................................................................111
4.2.6 Port 5 ..........................................................................................................................................112
4.2.7 Port 6 ..........................................................................................................................................113
4.2.8 Port 7 ..........................................................................................................................................116
4.2.9 Port 12 ........................................................................................................................................117
4.2.10 Port 13 ........................................................................................................................................118
4.2.11 Port 14 ........................................................................................................................................119
4.3 Registers Controlling Port Function..................................................................................... 123
4.4 Port Function Operations ...................................................................................................... 128
4.4.1 Writing to I/O port ........................................................................................................................128
4.4.2 Reading from I/O port..................................................................................................................128
4.4.3 Operations on I/O port.................................................................................................................128
CHAPTER 5 EXTERNAL BUS INTERFACE ...................................................................................... 129
5.1 External Bus Interface............................................................................................................ 129
5.2 Registers Controlling External Bus Interface...................................................................... 132
5.3 External Bus Interface Function Timing .............................................................................. 135
5.4 Example of Connection with Memory................................................................................... 140
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User's Manual U15947EJ2V0UD
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