HD404849FS datasheet(9/127 Pages) RENESAS

9 / 127 page

HD404849 Series

Memory Map

ROM Memory Map

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

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

of the reset and interrupt routines. After MCU reset or an interrupt, program execution continues 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–$1FFF: HD404848; $0000–$2FFF: HD4048412; $0000–$3FFF: HD404849,

HD4074849): Used for program coding.

4095

8191

12287

16383

$0000

$000F

$003F

$0FFF

$1FFF

$2FFF

$3FFF

HD404849/

HD4074849

program area

(16,384 words)

HD4048412

program area

(12,288 words)

HD404848

program area

(8,192 words)

Pattern area

(4,096 words)

Zero-page

subroutine area

(64 words)

Vector address area

(16 words)

$0000

$0001

$0002

$0003

$0004

$0005

$0006

$0007

$0008

$0009

$000A

$000B

$000C

$000D

$000E

$000F

JMPL instruction

(jump to

RESET, STOPC routine)

JMPL instruction

(jump to

INT routine)

JMPL instruction

(jump to

INT routine)

JMPL instruction

(jump to timer A routine)

JMPL instruction

(jump to timer B, INT routine)

JMPL instruction

(jump to timer C, INT routine)

JMPL instruction

(jump to timer D routine)

JMPL instruction

(jump to A/D, serial routine)

Figure 1 ROM Memory Map

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