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UPD17231 Datasheet(PDF) 36 Page - Renesas Technology Corp

Part # UPD17231
Description  MOS INTEGRATED CIRCUIT
PDF  94 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD17231 Datasheet(HTML) 36 Page - Renesas Technology Corp

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Data Sheet U14360EJ1V0DS00
µPD17230, 17231, 17232, 17233, 17234, 17235, 17236
34
3.9
Selecting I/O Mode of Group I/O
An I/O that is set in the input or output mode in 4-bit units is called a group I/O. P0C and P0D can be used as
group I/O ports. The input and output modes of these ports are selected by using the following register file. If the
mode is changed from input to output, the contents of the port register are output to the respective ports as soon as
the mode has been changed.
3
210
P0DGIO
P0CGIO
0
0
Address
RF : 37H
On reset
CH
R/W
R/W
P0CGIO
0
1
I/O mode of P0C0-P0C3
Sets P0C0-P0C3 in input mode.
Sets P0C0-P0C3 in output mode.
P0DGIO
0
1
I/O mode of P0D0-P0D3
Sets P0D0-P0D3 in input mode.
Sets P0D0-P0D3 in output mode.



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