UPD6125A Просмотр технического описания (PDF) - NEC => Renesas Technology

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UPD6125A

4-BIT SINGLE CHIP MICROCONTROLLER FOR REMOTE CONTROL TRANSMISSION

NEC => Renesas Technology 

µPD6125A, 6126A

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.

When “all clear” is input or on reset, input/output mode goes into effect, and the value of output latch becomes

undefined.

Figure 11-1. KI/O Pin Organization

(P1 )

Countrol

P10

P00

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 Organization

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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