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UPD61P24CS Datasheet(PDF) 9 Page - NEC

No. de pieza UPD61P24CS
Descripción Electrónicos  4-BIT SINGLE-CHIP MICROCONTROLLER FOR REMOTE CONTROL TRANSMISSION
PDF  36 Pages
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Fabricante Electrónico  NEC [NEC]
Página de inicio  http://www.nec.com/
Logo NEC - NEC

UPD61P24CS Datasheet(HTML) 9 Page - NEC

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µPD61P24
9
11. PIN FUNCTIONS
11.1
KI/O Pin (P0)
This is the 8-bit I/O pin for key-scan output. When the control register (P1) is set for the input port, the port can
be used as an 8-bit input pin. When the port is set for the input mode, all of these pins are pulled down to the VSS
level inside the LSI.
At reset (all cleared), the value of I/O mode and output latch becomes undefined.
Figure 11-1. KI/O Pin Organization
KI/O7
KI/O6
KI/O5
KI/O4
KI/O3
KI/O2
KI/O1
KI/O0
P0
P10
P00
(P )
Control register
1
11.2
KI/O Pull-Down Resistor Configuration
V DD
V SS
CMOS
N-ch
Pin
Pull-down resistor
Input signal
Output signal
Input/output selection
N-ch
P-ch
R
When KI/O is set to the input mode, pull-down resistor R is turned on.



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