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11
4.4.3
Arithmetic operation of I/O port....................................................................................................85
CHAPTER 5 CLOCK GENERATION CIRCUIT.........................................................................................87
5.1
5.2
5.3
5.4
Clock Generation Circuit Functions.........................................................................................87
Clock Generation Circuit Configuration ..................................................................................87
Registers Controlling Clock Generation Circuit .....................................................................89
System Clock Oscillators..........................................................................................................92
5.4.1
Main system clock oscillator........................................................................................................92
5.4.2
Subsystem clock oscillator ..........................................................................................................93
5.4.3
Scaler ..........................................................................................................................................95
5.4.4
When no subsystem clocks are used..........................................................................................95
Clock Generation Circuit Operation.........................................................................................96
Changing Setting of System Clock and CPU Clock................................................................97
5.6.1
Time required for switching between system clock and CPU clock ............................................97
5.6.2
Switching between system clock and CPU clock........................................................................98
5.5
5.6
CHAPTER 6 16-BIT TIMER COUNTER ....................................................................................................99
6.1
6.2
6.3
6.4
16-Bit Timer Counter Functions .............................................................................................100
16-Bit Timer Counter Configuration.......................................................................................100
16-Bit Timer Counter Control Register ..................................................................................102
16-Bit Timer Counter Operation..............................................................................................103
6.4.1
Operation as interval timer ........................................................................................................103
6.4.2
Operation as free-running timer.................................................................................................104
Notes on Using 16-Bit Timer Counter....................................................................................106
6.5
CHAPTER 7 8-BIT TIMER COUNTER ....................................................................................................107
7.1
7.2
7.3
7.4
8-Bit Timer Counter Functions ...............................................................................................107
8-Bit Timer Counter Configuration.........................................................................................107
8-Bit Timer Counter Control Registers ..................................................................................109
8-Bit Timer Counter Operation................................................................................................110
7.4.1
Operation as interval timer ........................................................................................................110
Notes on Using 8-Bit Timer Counter......................................................................................112
7.5
CHAPTER 8 WATCH TIMER...................................................................................................................113
8.1
8.2
8.3
8.4
Watch Timer Functions ...........................................................................................................113
Watch Timer Configuration.....................................................................................................114
Watch Timer Control Register ................................................................................................115
Watch Timer Operation............................................................................................................116
8.4.1
Operation as watch timer...........................................................................................................116
8.4.2
Operation as interval timer ........................................................................................................116