UPD64A View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD64A

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

NEC => Renesas Technology 

µPD64A, 65

3. PORT REGISTERS (PX)

The KI/O port, the KI port, the special ports (S0, S1/LED, S2), and the control registers are treated as port registers.

Port register values after reset are shown below.

Figure 3-1. Port Register Configuration

KI/O7

KI3

0

0

Port register

After reset

P0

FFH

P10

P00

KI/O6

KI/O5

KI/O4

KI/O3

P1

KI/O2

KI/O1

KI/O0

×FHNote

P11

P01

KI2

KI1

KI0

S1/LED

S0

S2

1

P3 (control register 0)

03H

P13

P03

DP10

DP9

DP8

TCTL CARY MOD1 MOD0

P4 (control register 1)

26H

P14

P04

0

KI

pull-down

S0/S1

pull-down

S2

S1/LED mode KI/O mode

STOP release

S0 mode

Note ×: Value based on the KI pin state

Table 3-1. Relationship Between Ports and Read/Write

Port Name

KI/O

KI

S0

S1/LED

S2

Input Mode

Read

Write

Pin state

Output latch

Pin state

—

Pin state

—

Pin state

—

Pin state

—

Output Mode

Read

Write

Output latch Output latch

—

—

Note

—

Pin state

—

—

—

Note When in OFF mode, “1” is always read.

14

Data Sheet U14380EJ3V0DS00

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