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D17133CS Datasheet(PDF) 128 Page - NEC

Part # D17133CS
Description  4-BIT SINGLE-CHIP MICROCONTROLLER
PDF  289 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

D17133CS Datasheet(HTML) 128 Page - NEC

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CHAPTER 12
PORTS
113
12.7 PORT CONTROL REGISTER
12.7.1 Input/Output Switching by Group I/O
Ports which switch input/output in units of four bits are called group I/O. Port 0B is used as group I/O. The register
shown in the figure below is used for input/output switching.
Figure 12-2. Input/Output Switching by Group I/O
RF: 24H
Read/write
Initial value when reset
Bit 3
0
0
R/W
Read=R, write=W
P0BGIO
0
1
Function
Sets Port 0B to input mode.
Sets Port 0B to output mode.
Bit 2
0
0
Bit 1
0
0
Bit 0
P0BGIO
0



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