NEC PD789860 User Manual page 12

7.5 Clock Generator Operation .......................................................................................................74
7.6 Changing Setting of CPU Clock................................................................................................75
7.6.1 Time required for switching CPU clock ........................................................................................75
7.6.2 Switching CPU clock ...................................................................................................................75
CHAPTER 8 CLOCK GENERATOR (
8.1 Clock Generator Functions .......................................................................................................76
8.2 Clock Generator Configuration ................................................................................................76
8.3 Clock Generator Control Register............................................................................................77
8.4 System Clock Oscillators ..........................................................................................................78
8.4.1 System clock oscillator ................................................................................................................78
8.4.2 Examples of incorrect resonator connection................................................................................79
8.4.3 Frequency divider ........................................................................................................................80
8.5 Clock Generator Operation .......................................................................................................81
8.6 Changing Setting of CPU Clock................................................................................................82
8.6.1 Time required for switching CPU clock ........................................................................................82
8.6.2 Switching CPU clock ...................................................................................................................82
CHAPTER 9 8-BIT TIMERS 30 AND 40..............................................................................................83
9.1 8-Bit Timers 30, 40 Functions ...................................................................................................83
9.2 8-Bit Timers 30, 40 Configuration.............................................................................................84
9.3 8-Bit Timers 30, 40 Control Registers ......................................................................................88
9.4 8-Bit Timers 30, 40 Operation ...................................................................................................93
9.4.1 Operation as 8-bit timer counter ..................................................................................................93
9.4.2 Operation as 16-bit timer counter ..............................................................................................102
9.4.3 Operation as carrier generator...................................................................................................109
9.4.4 Operation as PWM output (timer 40 only)..................................................................................114
9.5 Notes on Using 8-Bit Timers 30, 40........................................................................................116
CHAPTER 10 WATCHDOG TIMER .....................................................................................................118
10.1 Watchdog Timer Functions.....................................................................................................118
10.2 Watchdog Timer Configuration ..............................................................................................119
10.3 Watchdog Timer Control Registers........................................................................................120
10.4 Watchdog Timer Operation .....................................................................................................122
10.4.1 Operation as watchdog timer.....................................................................................................122
10.4.2 Operation as interval timer.........................................................................................................123
CHAPTER 11 POWER-ON-CLEAR CIRCUITS ...................................................................................124
11.1 Power-on-Clear Circuit Functions..........................................................................................124
11.2 Power-on-Clear Circuit Configuration ...................................................................................124
11.3 Power-on-Clear Circuit Control Registers.............................................................................126
11.4 Power-on-Clear Circuit Operation ..........................................................................................128
11.4.1 Power-on-clear (POC) circuit operation .....................................................................................128
11.4.2 Operation of low-voltage detection (LVI) circuit .........................................................................130
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PD789861 SUBSERIES)........................................................76
User's Manual U14826EJ5V0UD