HD6473032F Datasheet, PDF(137/572 Page) Hitachi Semiconductor – Hitachi Microcomputer

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HD6473032F Datasheet, PDF (137/572 Pages) Hitachi Semiconductor – Hitachi Microcomputer

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7.2 Port 1

7.2.1 Overview

Port 1 is an 8-bit input/output port with the pin configuration shown in figure 7-1. The pin functions

differ depending on the operating mode. In mode 1, they are address bus output pins (A7 to A0).

In modes 2 and 3, port 1 is a generic input/output port.

Pins in port 1 can drive one TTL load and a 90-pF capacitive load. They can also drive a darlington

transistor pair.

Port 1

Port 1 pins

P17 /A7

P16 /A6

P15 /A5

P14 /A4

P13 /A3

P12 /A2

P11 /A1

P10 /A0

Modes 1

P17 (input)/A 7 (output)

P16 (input)/A 6 (output)

P15 (input)/A 5 (output)

P14 (input)/A 4 (output)

P13 (input)/A 3 (output)

P12 (input)/A 2 (output)

P11 (input)/A 1 (output)

P10 (input)/A 0 (output)

Modes 2 and 3

P17 (input/output)

P16 (input/output)

P15 (input/output)

P14 (input/output)

P13 (input/output)

P12 (input/output)

P11 (input/output)

P10 (input/output)

Figure 7-1 Port 1 Pin Configuration

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