AT89C5132-ROTUL datasheet(106/181 Pages) ATMEL

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106

4173D–USB–02/06

AT89C5132

Table 87. External Data Memory Interface Signals

17.2

Registers

Table 88. DAT16H Register

DAT16H (S:F9h) – Data 16 High Order Byte

Reset Value = 0000 0000b

Signal

Name

Type

Description

Alternate

Function

A15:8

I/O

Address Lines

Upper address lines for the external bus.

Multiplexed higher address and data lines for the IDE interface.

P2.7:0

AD7:0

I/O

Address/Data Lines

Multiplexed lower address and data lines for the IDE interface.

P0.7:0

ALE

Address Latch Enable

ALE signals indicates that valid address information is available on lines AD7:0.

Read

Read signal output to external data memory.

P3.7

Write

Write signal output to external memory.

P3.6

765

4321

D15

D14

D13

D12

D11

D10

Bit Number

Bit

Mnemonic

Description

7 - 0

D15:8

Data 16 High Order Byte

When EXT16 bit is set, DAT16H is set by software with the high order data byte prior any

MOVX write instruction.

When EXT16 bit is set, DAT16H contains the high order data byte after any MOVX read

instruction.

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