UPD17015GS datasheet(35/120 Pages) NEC

35 / 120 page

µPD17015

9. GENERAL-PURPOSE PORTS

A general-purpose port outputs high and low signals to external circuits and reads high and low signals from the

external circuits.

9.1

OVERVIEW

Table 9-1 indicates the relationship between the ports and port registers.

General-purpose ports are classified into three types: I/O ports, input ports, and output ports.

I/O port is a bit I/O port, whose bit (each pin) can be set to input or output mode.

Table 9-1 Relationship between Ports (Pins) and Port Registers

Port

No.

Pin name

I/O

Data setting method

Port register (data memory)

Address

Bit symbol

(reserved word)

P0A0

P0A1

P0A2

P0A3

P0B0

P0B1

P0B2

No target pin

P0C0

P0C1

P0C2

P0C3

P0D0

No target pin

Port 0A

Port 0B

Port 0C

Port 0D

Remarks

Symbol

P0A0

P0A1

P0A2

P0A3

P0B0

P0B1

P0B2

—

P0C0

P0C1

P0C2

P0C3

P0D0

—

70H

P0A

71H

P0B

72H

P0C

73H

P0D

Output

Input

Output

I/O switching is per-

formed by the P0ABIO0

or P0ABIO1 flag.

Fixed to 0.

Switching to BEEP

output is performed by

the BEEP0SEL flag.

Fixed to 0.

Output

I/O

(bit I/O)

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