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UPD784938 Datasheet(PDF) 14 Page - NEC |
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UPD784938 Datasheet(HTML) 14 Page - NEC |
14 / 733 page ![]() 14 Preliminary User’s Manual U13987EJ1V0UM00 4.2 Control Registers ..................................................................................................................... 107 4.2.1 Standby control register (STBC) ................................................................................................. 107 4.2.2 Oscillation stabilization time specification register (OSTS) ....................................................... 109 4.3 Clock Generator Operation .................................................................................................... 110 4.3.1 Clock oscillator ............................................................................................................................. 110 4.3.2 Divider .......................................................................................................................................... 110 4.4 Cautions .................................................................................................................................... 111 4.4.1 When an external clock is input .................................................................................................. 111 4.4.2 When crystal/ceramic oscillation is used .................................................................................... 112 CHAPTER 5 REGULATOR ...................................................................................................................... 115 5.1 Outline of Regulator ................................................................................................................ 115 CHAPTER 6 PORT FUNCTIONS ........................................................................................................... 117 6.1 Digital Input/Output Ports ....................................................................................................... 117 6.2 Port 0 ......................................................................................................................................... 119 6.2.1 Hardware configuration ................................................................................................................ 119 6.2.2 I/O mode/control mode setting .................................................................................................... 120 6.2.3 Operating status ........................................................................................................................... 121 6.2.4 On-chip pull-up resistors .............................................................................................................. 123 6.2.5 Transistor drive ............................................................................................................................ 125 6.3 Port 1 ......................................................................................................................................... 126 6.3.1 Hardware configuration ................................................................................................................ 127 6.3.2 I/O mode/control mode setting .................................................................................................... 131 6.3.3 Operating status ........................................................................................................................... 132 6.3.4 On-chip pull-up resistors .............................................................................................................. 135 6.3.5 Direct LED drive ........................................................................................................................... 136 6.4 Port 2 ......................................................................................................................................... 137 6.4.1 Hardware configuration ................................................................................................................ 139 6.4.2 Input mode/control mode setting ................................................................................................. 141 6.4.3 Operating status ........................................................................................................................... 141 6.4.4 On-chip pull-up resistors .............................................................................................................. 141 6.5 Port 3 ......................................................................................................................................... 143 6.5.1 Hardware configuration ................................................................................................................ 144 6.5.2 I/O mode/control mode setting .................................................................................................... 148 6.5.3 Operating status ........................................................................................................................... 150 6.5.4 On-chip pull-up resistors .............................................................................................................. 153 6.6 Port 4 ......................................................................................................................................... 155 6.6.1 Hardware configuration ................................................................................................................ 155 6.6.2 I/O mode/control mode setting .................................................................................................... 156 6.6.3 Operating status ........................................................................................................................... 157 6.6.4 On-chip pull-up resistors .............................................................................................................. 159 6.6.5 Direct LED drive ........................................................................................................................... 161 6.7 Port 5 ......................................................................................................................................... 162 6.7.1 Hardware configuration ................................................................................................................ 162 6.7.2 I/O mode/control mode setting .................................................................................................... 163 6.7.3 Operating status ........................................................................................................................... 164 6.7.4 On-chip pull-up resistors .............................................................................................................. 166 |
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