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UPD17P136ACT Datasheet(PDF) 126 Page - NEC

Part # UPD17P136ACT
Description  4-BIT SINGLE-CHIP MICROCONTROLLER
PDF  292 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD17P136ACT Datasheet(HTML) 126 Page - NEC

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CHAPTER 12 PORTS
107
12.7.2 Input/Output Switching by Bit I/O
Ports which switch input/output in 1-bit unit are called bit I/O. Port 0C and port 0D are used as bit I/O. The register
shown in the figure below is used for input/output switching.
Figure 12-2. Port Control Register of Bit I/O (1/2)
Bit 3
Bit 2
Bit 1
Bit 0
P0CBIO3
P0CBIO2
P0CBIO1
P0CBIO0
R/W
0000
0
P0CBIO0
Function
Sets P0C0 to input mode.
1
Sets P0C0 to output mode.
Read/write
Initial value when reset
0
P0CBIO1
Function
Sets P0C1 to input mode.
1
Sets P0C1 to output mode.
0
P0CBIO2
Function
Sets P0C2 to input mode.
1
Sets P0C2 to output mode
0
P0CBIO3
Function
Sets P0C3 to input mode.
1
Sets P0C3 to output mode.
RF: 1CH
Read = R, write = W



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