HD40A4639R datasheet(8/135 Pages) RENESAS

Part #	HD40A4639R

Description	4-Bit Single-Chip Microcomputer

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Manufacturer	RENESAS [Renesas Technology Corp]

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HD404639R Series

6

Memory Map

ROM Memory Map

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

0

15

16

63

64

4095

4096

16383

0

$000F

$0FFF

$1000

$3FFF

$0010

$003F

$0040

Vector address

Zero-page subroutine

(64 words)

Pattern

(4,096 words)

Program

(8,192 words)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

$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, INT routine)

JMPL instruction

(Jump to timer C, INT routine)

JMPL instruction

(Jump to timer D, INT routine)

JMPL instruction

(Jump to

INT routine)

JMPL instruction

(Jump to serial 1, serial 2 routine)

2

3

Program

(16,384 words)

For HD404638R, HD40A4638R

For HD404639R, HD40A4639R,

HD407A4639R

4

8191

8192

$1FFF

$2000

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 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 (HD404638R, HD40A4638R), $0000–$3FFF (HD404639R,

HD40A4639R, HD407A4639R)): Used for program coding.

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HD40A4639R Datasheet(PDF) 8 Page - Renesas Technology Corp

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