COM20019IP datasheet(32/81 Pages) SMSC

32 / 81 page

DISCONTINUED DATASHEET

DATA

COMMAND

DESCRIPTION

000r p110

Clear Flags

This command resets certain status bits of the COM20019. A

logic "1" on "p" resets the POR status bit and the EXCNAK

Diagnostic status bit. A logic "1" on "r" resets the RECON status

bit.

0000 1000

Clear

Receive

Interrupt

This command is used only in the Command Chaining operation.

Please refer to the Command Chaining section for definition of

this command.

Table 7 - Address Pointer High Register

BIT

BIT NAME

SYMBOL

DESCRIPTION

Read Data

RDDATA

This bit tells the COM20019 whether the following access

will be a read or write. A logic "1" prepares the device for a

read, a logic "0" prepares it for a write.

Auto Increment

AUTOINC

This bit controls whether the address pointer will increment

automatically.

A logic "1" on this bit allows automatic

increment of the pointer after each access, while a logic "0"

disables this function.

Please refer to the Sequential

Access Memory section for further detail.

5-3

(Reserved)

These bits are undefined.

2-0

Address 10-8

A10-A8

These bits hold the upper three address bits which provide

addresses to RAM.

Table 8 - Address Pointer Low Register

BIT

BIT NAME

SYMBOL

DESCRIPTION

7-0

Address 7-0

A7-A0

These bits hold the lower 8 address bits which provide the

addresses to RAM.

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