NEC mPD784225 Series User Manual page 13

4.4.1 Main system clock oscillator ......................................................................................................... 100
4.4.2 Subsystem clock oscillator ............................................................................................................ 101
4.4.3 Frequency divider ......................................................................................................................... 104
4.4.4 When no subsystem clocks are used ........................................................................................... 104
4.5 Clock Generator Operations ................................................................................................ 105
4.5.1 Main system clock operations ....................................................................................................... 106
4.5.2 Subsystem clock operations ......................................................................................................... 107
4.6 Changing System Clock and CPU Clock Settings ............................................................. 107
CHAPTER 5 PORT FUNCTIONS ....................................................................................................... 109
5.1 Digital I/O Ports ..................................................................................................................... 109
5.2 Port Configuration ................................................................................................................ 111
5.2.1 Port 0 ........................................................................................................................................... 111
5.2.2 Port 1 ........................................................................................................................................... 113
5.2.3 Port 2 ........................................................................................................................................... 114
5.2.4 Port 3 ........................................................................................................................................... 118
5.2.5 Port 4 ........................................................................................................................................... 120
5.2.6 Port 5 ........................................................................................................................................... 122
5.2.7 Port 6 ........................................................................................................................................... 124
5.2.8 Port 7 ........................................................................................................................................... 128
5.2.9 Port 12 ......................................................................................................................................... 131
5.2.10 Port 13 ......................................................................................................................................... 132
5.3 Control Registers .................................................................................................................. 133
5.4 Operations ............................................................................................................................. 138
5.4.1 Writing to I/O port ........................................................................................................................ 138
5.4.2 Reading from I/O port .................................................................................................................. 138
5.4.3 Operations on I/O port ................................................................................................................. 138
CHAPTER 6 REAL-TIME OUTPUT FUNCTIONS ................................................................................ 139
6.1 Functions ............................................................................................................................... 139
6.2 Configuration ........................................................................................................................ 139
6.3 Control Registers .................................................................................................................. 142
6.4 Operation ............................................................................................................................... 144
6.5 Using This Function ............................................................................................................. 145
6.6 Cautions ................................................................................................................................ 145
CHAPTER 7 TIMER OVERVIEW ........................................................................................................ 146
CHAPTER 8 16-BIT TIMER/EVENT COUNTER ................................................................................ 149
8.1 Function ................................................................................................................................. 149
8.2 Configuration ........................................................................................................................ 150
8.3 Control Registers .................................................................................................................. 154
8.4 Operation ............................................................................................................................... 160
8.4.1 Operation as interval timer (16 bits) ............................................................................................ 160
8.4.2 PPG output operation .................................................................................................................. 162
8.4.3 Pulse width measurement ........................................................................................................... 163
8.4.4 Operation as external event counter ........................................................................................... 170
User's Manual U12697EJ3V0UM
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