5.4.1
5.4.2
5.4.3
5.4.4
5.4.5
X1 oscillator ..................................................................................................................................126
Subsystem clock oscillator............................................................................................................126
When subsystem clock is not used...............................................................................................129
Ring-OSC oscillator ......................................................................................................................129
Prescaler.......................................................................................................................................129
5.5 Clock Generator Operation ..................................................................................................... 130
5.6 Time Required to Switch Between Ring-OSC Clock and X1 Input Clock........................... 137
5.7 Time Required for CPU Clock Switchover............................................................................. 138
5.8 Clock Switching Flowchart and Register Setting ................................................................. 139
5.8.1
5.8.2
5.8.3
5.8.4
5.8.5
Switching from Ring-OSC clock to X1 input clock.........................................................................139
Switching from X1 input clock to Ring-OSC clock.........................................................................140
Switching from X1 input clock to subsystem clock........................................................................141
Switching from subsystem clock to X1 input clock........................................................................142
Register settings...........................................................................................................................143
CHAPTER 6 16-BIT TIMER/EVENT COUNTERS 00 AND 01......................................................... 144
6.1 Functions of 16-Bit Timer/Event Counters 00 and 01........................................................... 144
6.2 Configuration of 16-Bit Timer/Event Counters 00 and 01.................................................... 145
6.3 Registers Controlling 16-Bit Timer/Event Counters 00 and 01 ........................................... 150
6.4 Operation of 16-Bit Timer/Event Counters 00 and 01........................................................... 160
6.4.1
6.4.2
6.4.3
6.4.4
6.4.5
6.4.6
Interval timer operation.................................................................................................................160
PPG output operations .................................................................................................................163
Pulse width measurement operations...........................................................................................166
External event counter operation..................................................................................................174
Square-wave output operation......................................................................................................177
One-shot pulse output operation...................................................................................................179
6.5 Cautions for 16-Bit Timer/Event Counters 00 and 01........................................................... 184
CHAPTER 7 8-BIT TIMER/EVENT COUNTERS 50 AND 51........................................................... 187
7.1 Functions of 8-Bit Timer/Event Counters 50 and 51............................................................. 187
7.2 Configuration of 8-Bit Timer/Event Counters 50 and 51...................................................... 189
7.3 Registers Controlling 8-Bit Timer/Event Counters 50 and 51 ............................................. 191
7.4 Operations of 8-Bit Timer/Event Counters 50 and 51........................................................... 196
7.4.1
7.4.2
7.4.3
7.4.4
Operation as interval timer............................................................................................................196
Operation as external event counter.............................................................................................198
Square-wave output operation......................................................................................................199
PWM output operation..................................................................................................................200
7.5 Cautions for 8-Bit Timer/Event Counters 50 and 51............................................................. 204
CHAPTER 8 8-BIT TIMERS H0 AND H1 .......................................................................................... 205
8.1 Functions of 8-Bit Timers H0 and H1..................................................................................... 205
8.2 Configuration of 8-Bit Timers H0 and H1............................................................................... 205
8.3 Registers Controlling 8-Bit Timers H0 and H1...................................................................... 209
8.4 Operation of 8-Bit Timers H0 and H1 ..................................................................................... 214
8.4.1
Operation as interval timer/square-wave output ...........................................................................214
User’s Manual U16228EJ2V0UD
12
NEC [ NEC ]
