AT83SND1CXXX-ROTIL datasheet(132/212 Pages) ATMEL

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132

4109J–8051–10/06

AT8xC51SND1C

Table 111. External Data Memory Interface Signals

16.2

Registers

Table 112. DAT16H Register

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

Reset Value =XXXX XXXXb

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

7654

3210

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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