![](http://datasheet.mmic.net.cn/380000/-PD78F9801_datasheet_16745018/-PD78F9801_12.png)
12
3.3
Instruction Address Addressing ..............................................................................................52
3.3.1
Relative addressing ......................................................................................................................52
3.3.2
Immediate addressing ..................................................................................................................53
3.3.3
Table indirect addressing..............................................................................................................54
3.3.4
Register addressing......................................................................................................................54
Operand Address Addressing ..................................................................................................55
3.4.1
Direct addressing..........................................................................................................................55
3.4.2
Short direct addressing.................................................................................................................56
3.4.3
Special function register (SFR) addressing ..................................................................................57
3.4.4
Register addressing......................................................................................................................58
3.4.5
Register indirect addressing .........................................................................................................59
3.4.6
Based addressing.........................................................................................................................60
3.4.7
Stack addressing ..........................................................................................................................60
3.4
CHAPTER 4 PORT FUNCTIONS..............................................................................................................61
4.1
4.2
Port Functions............................................................................................................................61
Port Configuration.....................................................................................................................63
4.2.1
Port 0 ............................................................................................................................................64
4.2.2
Port 1 ............................................................................................................................................65
4.2.3
Port 2 ............................................................................................................................................66
4.2.4
Port 4 ............................................................................................................................................72
Registers Controlling Port Function........................................................................................73
Port Function Operation............................................................................................................76
4.4.1
Writing to I/O port..........................................................................................................................76
4.4.2
Reading from I/O port ...................................................................................................................76
4.4.3
Arithmetic operation of I/O port.....................................................................................................76
4.3
4.4
CHAPTER 5 CLOCK GENERATION CIRCUIT.........................................................................................77
5.1
5.2
5.3
5.4
Clock Generation Circuit Functions.........................................................................................77
Clock Generation Circuit Configuration..................................................................................77
Register Controlling Clock Generation Circuit.......................................................................78
System Clock Oscillators..........................................................................................................79
5.4.1
Main system clock oscillator .........................................................................................................79
5.4.2
Divider circuit ................................................................................................................................82
Clock Generation Circuit Operation.........................................................................................82
Changing Setting of CPU Clock ............................................................................................... 83
5.6.1
Time required for switching CPU clock.........................................................................................83
5.6.2
Switching CPU clock.....................................................................................................................83
5.5
5.6
CHAPTER 6 8-BIT TIMER/EVENT COUNTER.........................................................................................85
6.1
6.2
6.3
8-Bit Timer/Event Counter Functions......................................................................................85
8-Bit Timer/Event Counter Configuration................................................................................86
Registers Controlling 8-Bit Timer/Event Counter...................................................................88