HD404394 View Datasheet(PDF) - Hitachi -> Renesas Electronics

Part Name

Description

MFG CO.

HD404394

4-bit microcomputers

Hitachi -> Renesas Electronics 

HD404344R Series/HD404394 Series

Notes On ROM Out

Please pay attention to the following items regarding ROM out.

On ROM out, fill the ROM area indicated below with 1s to create the same data size as 4-kword versions

(HD404344R and HD404394). A 4-kword data size is required to change ROM data to mask

manufacturing data since the program used is for a 4-kword version.

This limitation apply to the case of using EPROM and the case of using data base.

ROM 1 kwords version:

HD404341R, HD40C4341R,

HD404391

Address $0400 to $0FFF

$0000

$000F

$0010

$003F

$0040

$03FF

$0400

Vector address

Zero page subroutine

(64 words)

Pattern and program

(1,024 words)

Not used

$0FFF

Fill this area with all 1s

ROM 2 kwords version:

HD404342R, HD40C4342R,

HD404392

Address $0800 to $0FFF

$0000

$000F

$0010

$003F

$0040

$07FF

$0800

Vector address

Zero page subroutine

(64 words)

Pattern and program

(2,048 words)

Not used

$0FFF

97

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