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INPUT/OUTPUT PINS

7906 Group User’s Manual Rev.2.0

5-2

5.1 Overview, 5.2 Programmable I/O ports

5.1 Overview

Input/output pins (hereafter called I/O pins) have functions as programmable I/O port pins, internal peripheral

devices’s I/O pins, etc.

For the basic functions of each I/O pin, refer to section “1.3 Pin description.” For the I/O functions of the

internal peripheral devices, refer to relevant sections of each internal peripheral device.

This chapter describes the programmable I/O ports and examples of handling unused pins.

5.2 Programmable I/O ports

The programmable I/O ports have direction registers and port registers in the SFR area. Figure 5.2.1 shows

the memory map of direction registers and port registers.

Fig. 5.2.1 Memory map of direction registers and port registers

Addresses

Port P2 register

Port P5 register

Port P7 register

Port P6 register

Port P1 register

Port P2 direction register

Port P1 direction register

Port P6 direction register

Port P5 direction register

Port P7 direction register

316

416

516

616

716

816

916

A16

B16

C16

D16

E16

F16

1016

1116

(Note)

Note: Do not write to this address.

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