UPD17062 datasheet(191/298 Pages) RENESAS

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189

µPD17062

15. GENERAL-PURPOSE PORT

A general-purpose port outputs a high level, low level, or floating signal to an external circuit and reads

a high level or low level signal from an external circuit.

15.1

CONFIGURATION AND CLASSIFICATION OF GENERAL-PURPOSE PORT

Fig. 15-1 shows a block diagram of the general-purpose port.

Table 15-1 lists the classifications of general-purpose ports.

As shown in Fig. 15-1, the general-purpose port consists of Port0A (P0A) to Port1C (P1C), that set data

according to addresses 70H to 73H (port register) in each bank of data memory. The same port register is

mapped to both BANK0 and BANK2.

Each port consists of general-purpose port pins. For example, Port0A consists of pin P0A3 to pin P0A0.

As stated in Table 15-1, general-purpose ports are classified into I/O shared ports (I/O ports), input-only ports

(input ports), and output-only ports (output ports).

I/O ports are classified into bit I/O ports which allow I/O to be specified in 1-bit (1-pin) units and group

I/O ports in which I/O can be specified in 3-bit (3-pin) units .

Fig. 15-1

Block Diagram of General-Purpose Port

Fixed

BANK0

BANK1

BANK2

0123456789ABCDEF

Column address

Data memory

Port register

System register

Bit

I/O

Bit

I/O

Bit

I/O

Group

I/O

Bit

I/O

Bit

I/O Out In

Out In

Out

I/O setting

Example configuration

of P0A pins

Control register

3210

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