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UPD784938 Datasheet(PDF) 14 Page - NEC

Part # UPD784938
Description  16-Bit Single-Chip Microcontrollers
Download  733 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD784938 Datasheet(HTML) 14 Page - NEC

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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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