UPD62A View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD62A

4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION

NEC => Renesas Technology 

µPD62A

3.4 Control Register 1 (P4)

Control register 1 consists of 8 bits. The contents that can be controlled are as shown below.

When reset, this register becomes 0010 0110B.

Table 3-6. Control Register 1 (P4)

Bit

Name

b7

—

Set

0

value

1

After reset

Fixed

to 0

0

b6

—

Fixed

to 0

0

b5

b4

b3

KI

S0/S1

—

Pull-down Pull-down

OFF OFF Fixed

ON

ON

to “0”

1

0

0

b2

b1

S1/LED KI/O

mode mode

S1

IN

LED OUT

1

1

b0

S0

mode

OFF

IN

0

b0: Specifies the input mode of the S0 port. “0” = OFF mode (high impedance); “1” = IN (input mode).

b1: Specifies the I/O mode of the KI/O port.

“0” = IN (input mode); “1” = OUT (output mode).

b2: Specifies the I/O mode of the S1/LED port. “0” = S1 (input mode); “1” = LED (output mode).

b4: Specifies the connection of a pull-down resistor in S0/S1 port input mode. “0” = OFF (not connected);

“1” = ON (connected)

b5: Specifies the connections of a pull-down resistor in KI port. “0” = OFF (not connected);

“1” = ON (connected).

Remark In output mode or in OFF mode, all the pull-down resistors are automatically disconnected.

18

Data Sheet U14474EJ1V0DS00

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