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7721 Group User’s Manual

INPUT/OUTPUT PINS

6–2

6.1 Overview

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

devices’s I/O pins, external buses, 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. For the external

address bus, external data bus, bus control signals, etc., refer to “CHAPTER 3. CONNECTION WITH

EXTERNAL DEVICES.”

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

6.2 Programmable I/O ports

The programmable I/O ports have direction registers and port registers in the SFR area. Figure 6.2.1 shows

the memory map of direction registers and port registers.

6.1 Overview, 6.2 Programmable I/O ports

Fig. 6.2.1 Memory map of direction registers and port registers

Port P6 register

Port P7 register

Port P6 direction register

Port P7 direction register

Port P8 register

Port P9 register

Port P8 direction register

Port P9 direction register

Port P10 register

Port P10 direction register

A16

B16

C16

D16

E16

F16

1016

1116

1216

1316

1416

Addresses

Port P4 register

Port P5 register

Port P4 direction register

Port P5 direction register

1516

1616

1716

1816

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