HD64F3437TF16 Datasheet, PDF(139/752 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 (139/752 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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7.3 Port 2

7.3.1 Overview

Port 2 is an 8-bit input/output port with the pin configuration shown in figure 7.5. The pin

functions differ depending on the operating mode.

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

3.

Pins in port 2 can drive one TTL load and a 90-pF capacitive load. They can also drive LEDs and

darlington transistors.

Port 2

110

Port 2 pins

P27/A15

P26/A14

P25/A13

P24/A12

P23/A11

P22/A10

P21/A9

P20/A8

Pin configuration

in mode 1

(expanded mode

with on-chip ROM

disabled)

A15 (output)

A14 (output)

A13 (output)

A12 (output)

A11 (output)

A10 (output)

A9 (output)

A8 (output)

Pin configuration

in mode 2

(expanded mode

with on-chip ROM

enabled)

A15 (output)/P27 (input)

A14 (output)/P26 (input)

A13 (output)/P25 (input)

A12 (output)/P24 (input)

A11 (output)/P23 (input)

A10 (output)/P22 (input)

A9 (output)/P21 (input)

A8 (output)/P20 (input)

Pin configuration in mode 3

(single-chip mode)

P27 (input/output)

P26 (input/output)

P25 (input/output)

P24 (input/output)

P23 (input/output)

P22 (input/output)

P21 (input/output)

P20 (input/output)

Figure 7.5 Port 2 Pin Configuration

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