MB90347CEPF datasheet(13/93 Pages) CYPRESS

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Document Number: 002-04498 Rev. *A

Page 12 of 92

MB90340E Series

3. Pin Description

(Continued)

Pin No.

Pin name

I/O

Circuit

type*3

Function

QFP100*1

LQFP100*2

1 to 4

99 to 2

P24 to P27

General purpose I/O pins. The register can be set to select whether to use a

pull-up resistor.In external bus mode, the pin is enabled as a general-purpose I/O

port when the corresponding bit in the external address output control register

(HACR) is 1.

A20 to A23

Output pins of the external address bus. When the corresponding bit in the

external address output control register (HACR) is 0, the pins are enabled as

high address output pins (A20 to A23).

IN0 to IN3

Trigger input pins for input captures.

P30

General purpose I/O pin.The register can be set to select whether to use a

pull-up resistor.

This function is enabled in single-chip mode.

ALE

Address latch enable output pin. This function is enabled when the external bus

is enabled.

IN4

Trigger input pin for input capture.

P31

General purpose I/O pin.The register can be set to select whether to use a

pull-up resistor.

This function is enabled in single-chip mode.

External read strobe output pin. This function is enabled when the external bus is

enabled.

IN5

Trigger input pin for input capture.

P32

General purpose I/O pin. The register can be set to select whether to use a

pull-up resistor. This function is enabled either in single-chip mode or when the

WR/WRL pin output is disabled.

WR / WRL

Write strobe output pin for the external data bus. This function is enabled when

both the external bus and the WR/WRL pin output are enabled. WRL is used to

write-strobe 8 lower bits of the data bus in 16-bit access while WR is used to

write-strobe 8 bits of the data bus in 8-bit access.

INT10R

External interrupt request input pin.

P33

General purpose I/O pin. The register can be set to select whether to use a

pull-up resistor.This function is enabled either in single-chip mode or when the

WRH pin output is disabled.

WRH

Write strobe output pin for the upper 8 bits of the external data bus. This function

is enabled when the external bus is enabled, when the external bus 16-bit mode

is selected, and when the WRH output pin is enabled.

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