EM73P982 datasheet(8/41 Pages) EMC

8 / 41 page

* This specification are subject to be changed without notice.

EM73P982

4-BIT MICROCONTROLLER

12.25.2001

SCALL, subroutine call entry address

Data table for

[LDAX],[LDAXI]

instruction

Subroutine call entry address

designated by [LCALL a]

instruction

PROGRAM ROM ( 16K X 8 bits ) for EM73P982

16 K x 8 bits program ROM contains user's program and some fixed data.

The basic structure of program ROM can be divided into 6 parts.

1. Address 0000h: Reset start address.

2. Address 0002h - 000Ch : 5 kinds of interrupt service routine entry addresses.

3. Address 000Eh-0086h : SCALL subroutine entry address, only available at 000Eh,0016h,001Eh,0026h,

002Eh, 0036h, 003Eh, 0046h, 004Eh, 0056h, 005Eh, 0066h, 006Eh, 0076h, 007Eh,

0086h.

4. Address 0000h - 07FFh : LCALL subroutine entry address.

5. Address 0000h - 1FFFh : Except used as above function, the other region can be used as user's program region.

6. Address 1000h - 1FFFh (bank 1, 2, 3) : Only these area could be used as program ROM Data area which used

by LDAX, LDAXI instruction.

address

Bank 0 :

0000h

Reset start address

0002h

INT0; interrupt service routine entry address

0004h

Reserved

0006h

TRGA

0008h

TRGB

000Ah

TBI

000Ch

SPI

000Eh

0086h

07FFh

0800h

0FFFh

1000h

Bank 1

1FFFh

Bank 2

Bank 3

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