HD64F3437TF16 Datasheet, PDF(133/752 Page) Hitachi Semiconductor – 12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.

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HD64F3437TF16 Datasheet, PDF (133/752 Pages) Hitachi Semiconductor – 12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.

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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.

Port 1 has built-in, programmable MOS input pull-up transistors that can be used in modes 2 and

3.

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

darlington transistors.

Port 1

104

Port 1 pins

P17/A7

P16/A6

P15/A5

P14/A4

P13/A3

P12/A2

P11/A1

P10/A0

Pin configuration

in mode 1

(expanded mode

with on-chip ROM

disabled)

A7 (output)

A6 (output)

A5 (output)

A4 (output)

A3 (output)

A2 (output)

A1 (output)

A0 (output)

Pin configuration

in mode 2

(expanded mode

with on-chip ROM

enabled)

A7 (output)/P17 (input)

A6 (output)/P16 (input)

A5 (output)/P15 (input)

A4 (output)/P14 (input)

A3 (output)/P13 (input)

A2 (output)/P12 (input)

A1 (output)/P11 (input)

A0 (output)/P10 (input)

Pin configuration in mode 3

(single-chip mode)

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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