HD404618TF datasheet(10/91 Pages) RENESAS

10 / 91 page

HD404618 Series

Memory Map

ROM Memory Map

The ROM memory map is shown in figure 1, and the ROM is described below.

4095

4096

8191

8192

16383

$000F

$0FFF

$1000

$1FFF

$2000

$3FFF

$0010

$003F

$0040

Vector address

Zero-page subroutine

(64 words)

Pattern

(4096 words)

Not used

$0000

$0001

$0002

$0003

$0004

$0005

$0006

$0007

$0008

$0009

$000A

$000B

$000C

$000D

$000E

$000F

JMPL instruction

(jump to reset 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 serial routine)

JMPL instruction

(jump to

INT routine)

* HD404612: 2048 words

HD404614: 4096 words

HD404616: 6144 words

HD404618, HD4074618: 8192 words

Program*

Note:

Figure 1 ROM Memory Map

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

of the reset and interrupt routines. After an MCU reset or interrupt execution, the program starts from the

vector address.

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–$07FF (HD404612), $0000–$0FFF (HD404614), $0000–$17FF (HD404616),

$0000–$1FFF (HD404618, HD4074618)): Used for program coding.

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