NEC mPD780024AS Series, Предварительное руководство пользователя

Страница: 11 / 311

11
Preliminary User’s Manual U16035EJ1V0UM
3.3 Instruction Address Addressing ............................................................................................ 62
3.3.1 Relative addressing ....................................................................................................................... 62
3.3.2 Immediate addressing ................................................................................................................... 63
3.3.3 Table indirect addressing ............................................................................................................... 64
3.3.4 Register addressing ...................................................................................................................... 64
3.4 Operand Address Addressing ................................................................................................ 65
3.4.1 Implied addressing ........................................................................................................................ 65
3.4.2 Register addressing ...................................................................................................................... 66
3.4.3 Direct addressing .......................................................................................................................... 67
3.4.4 Short direct addressing ................................................................................................................. 68
3.4.5 Special function register (SFR) addressing ................................................................................... 69
3.4.6 Register indirect addressing .......................................................................................................... 70
3.4.7 Based addressing ......................................................................................................................... 71
3.4.8 Based indexed addressing ............................................................................................................ 72
3.4.9 Stack addressing ........................................................................................................................... 72
CHAPTER 4 PORT FUNCTIONS ...................................................................................................... 73
4.1 Port Functions ......................................................................................................................... 73
4.2 Configuration of Ports ............................................................................................................. 75
4.2.1 Port 0 ............................................................................................................................................. 75
4.2.2 Port 1 ............................................................................................................................................. 76
4.2.3 Port 2 ............................................................................................................................................. 77
4.2.4 Port 3 ............................................................................................................................................. 79
4.2.5 Port 4 ............................................................................................................................................. 81
4.2.6 Port 5 ............................................................................................................................................. 82
4.2.7 Port 7 ............................................................................................................................................. 83
4.3 Registers to Control Port Function ........................................................................................ 85
4.4 Operations of Port Function ................................................................................................... 89
4.4.1 Writing to I/O port .......................................................................................................................... 89
4.4.2 Reading from I/O port .................................................................................................................... 89
4.4.3 Operations on I/O port ................................................................................................................... 89
CHAPTER 5 CLOCK GENERATOR ................................................................................................. 90
5.1 Functions of Clock Generator ................................................................................................ 90
5.2 Configuration of Clock Generator .......................................................................................... 90
5.3 Registers to Control Clock Generator ................................................................................... 92
5.4 System Clock Oscillator .......................................................................................................... 94
5.4.1 Main system clock oscillator .......................................................................................................... 94
5.4.2 Subsystem clock oscillator ............................................................................................................ 95
5.4.3 Divider ........................................................................................................................................... 98
5.4.4 When no subsystem clocks are used ............................................................................................ 98
5.5 Clock Generator Operations ................................................................................................... 99
5.5.1 Main system clock operations ....................................................................................................... 100
5.5.2 Subsystem clock operations .......................................................................................................... 101
5.6 Changing System Clock and CPU Clock Settings ................................................................ 101
5.6.1 Time required for switchover between system clock and CPU clock ............................................. 101