HD404318 datasheet(8/66 Pages) HITACHI

Part #	HD404318

Description	4-bit HMCS400-series microcomputer

Download	66 Pages

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Manufacturer	HITACHI [Hitachi Semiconductor]

Direct Link	http://www.renesas.com/eng

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8 / 66 page

HD404318 Series

8

Memory Map

ROM Memory Map

Vector Address Area ($0000–$000F): Reserved for JMPL instructions that branch to the start addresses

of the reset and interrupt routines.

Zero-Page Subroutine Area ($0000–$003F): Reserved for subroutines. The program branches to a

subroutine in this area in response to the CAL instruction.

Pattern Area ($0000–$0FFF): Contains ROM data that can be referenced with the P instruction.

Program Area ($0000–$0FFF (HD404314), $0000–$17FF (HD404316), $0000–$1FFF (HD404318,

HD4074318)): The entire ROM area can be used for program coding.

$000F

$0FFF

$1000

$0010

$003F

$0040

Vector address

(16 words)

Zero-page subroutine

(64 words)

Pattern

(4,096 words)

HD404314

Program

(4,096 words)

HD404316

Program

(6,144 words)

$0000

$0001

$0002

$0003

$0004

$0005

$0006

$0007

$0008

$0009

$000A

$000B

$000C

$000D

$000E

$000F

0

1

JMPL instruction

(jump to

RESET, STOPC routine)

JMPL instruction

(jump to

INT routine)

JMPL instruction

(jump to timer A routine)

JMPL instruction

(jump to timer B routine)

JMPL instruction

(jump to timer C routine)

JMPL instruction

(jump to A/D converter routine)

JMPL instruction

(jump to

INT routine)

JMPL instruction

(jump to serial routine)

HD404318, HD4074318

Program

(8,192 words)

$17FF

$1800

$1FFF

Note: Since the ROM address areas between $0000-$0FFF overlap, the user can determine how these areas

are to be used.

Figure 1 ROM Memory Map

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