NEC UPD789426 Series User Manual page 13

5.2 Clock Generator Configuration ..............................................................................................102
5.3 Registers Controlling Clock Generator .................................................................................104
5.4 System Clock Oscillators........................................................................................................108
5.4.1 Main system clock oscillator (crystal/ceramic oscillation)............................................................ 108
5.4.2 Main system clock oscillator (RC oscillation) (mask option) ........................................................ 109
5.4.3 Subsystem clock oscillator .......................................................................................................... 109
5.4.4 Example of incorrect resonator connection ................................................................................. 110
5.4.5 Divider circuit .............................................................................................................................. 114
5.4.6 When no subsystem clock is used .............................................................................................. 114
5.5 Clock Generator Operation.....................................................................................................115
5.6 Changing Setting of System Clock and CPU Clock .............................................................116
5.6.1 Time required for switching between system clock and CPU clock............................................. 116
5.6.2 Switching between system clock and CPU clock ........................................................................ 117
CHAPTER 6 16-BIT TIMER 90............................................................................................................119
6.1 16-Bit Timer 90 Functions .......................................................................................................119
6.2 16-Bit Timer 90 Configuration ................................................................................................120
6.3 Registers Controlling 16-Bit Timer 90 ...................................................................................123
6.4 16-Bit Timer 90 Operation .......................................................................................................127
6.4.1 Operation as timer interrupt ........................................................................................................ 127
6.4.2 Operation as timer output............................................................................................................ 129
6.4.3 Capture operation ....................................................................................................................... 130
6.4.4 16-bit timer counter 90 readout ................................................................................................... 131
6.4.5 Buzzer output operation ............................................................................................................. 132
6.5 Notes on 16-Bit Timer 90.........................................................................................................133
6.5.1 Notes on using 16-bit timer 90 .................................................................................................... 133
6.5.2 Restrictions on rewriting 16-bit compare register 90 ................................................................... 135
CHAPTER 7 8-BIT TIMERS 50, 60 ....................................................................................................137
7.1 8-Bit Timers 50, 60 Functions.................................................................................................137
7.2 8-Bit Timers 50, 60 Configuration ..........................................................................................138
7.3 Registers Controlling 8-Bit Timers 50, 60 .............................................................................144
7.4 8-Bit Timers 50, 60 Operation .................................................................................................150
7.4.1 Operation as 8-bit timer counter.................................................................................................. 150
7.4.2 Operation as 16-bit timer counter................................................................................................ 158
7.4.3 Operation as carrier generator .................................................................................................... 165
7.4.4 PWM free-running mode operation (timer 50)............................................................................. 170
7.4.5 Operation as PWM output (timer 60) .......................................................................................... 174
7.5 Notes on Using 8-Bit Timers 50, 60........................................................................................176
CHAPTER 8 WATCH TIMER ...............................................................................................................177
8.1 Watch Timer Functions ...........................................................................................................177
8.2 Watch Timer Configuration.....................................................................................................178
8.3 Watch Timer Control Register ................................................................................................179
8.4 Watch Timer Operation ...........................................................................................................180
User's Manual U15075EJ2V1UD
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