UPD61P24CS View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD61P24CS

4-BIT SINGLE-CHIP MICROCONTROLLER FOR REMOTE CONTROL TRANSMISSION

NEC => Renesas Technology 

µPD61P24

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

(P1 )

P10

P00

Control register

P0

KI/O7

KI/O6

KI/O5

KI/O4

KI/O3

KI/O2

KI/O1

KI/O0

11.2 KI/O Pull-Down Resistor Configuration

Input/output selection

Output signal

Input signal

CMOS

V DD

P-ch

Pin

N-ch

V SS

R Pull-down resistor

N-ch

When KI/O is set to the input mode, pull-down resistor R is turned on.

9

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