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EM73P982H

4-BIT MICROCONTROLLER

ELAN Microelectronics 

EM73P982

4-BIT MICROCONTROLLER

Bank 0

Increment

Address

000h - 00Fh

010h - 01Fh

020h - 02Fh

:

:

:

Zero-page

0C0h - 0CFh

0D0h - 0DFh

0E0h - 0EFh

0F0h - 0F3h

Level 0

Level 4

Level 8

Level 12

Level 1 Level 2 Level 3

Level 5 Level 6 Level 7

Level 9 Level 10 Level 11

Bank 1

ZERO- PAGE:

100h - 10Fh

110h - 11Fh

:

:

:

160h - 16Fh

170h - 17Fh

From 000h to 00Fh is the location of zero-page. It is used as the pointer in zero -page addressing mode for the

instruction of "STD #k,y; ADD #k,y; CLR y,b; CMP k,y".

PROGRAM EXAMPLE: To wirte immediate data "07h" to address "003h" of RAM and to clear bit 2 of RAM.

STD #07h, 03h ; RAM[03] ← 07h

CLR 0Eh,2 ; RAM[0Eh]2 ← 0

STACK:

There are 13 - level (maximum) stack for user using for subroutine (including interrupt and CALL). User

can assign any level to be the starting stack by giving the level number to stack pointer (SP).

When user using any instruction of CALL or subroutine, before entry the subroutine, the previous PC address

will be saved into stack until return from those subroutines, the PC value will be restored by the data saved

in stack.

DATA AREA:

Except the special area used by user, the whole RAM can be used as data area for storing and loading general

data.

ADDRESSING MODE

The 372 nibble data memory consists two banks (bank 0 and bank 1). There are 244x4 bits (address

000h~0F3h) on bank 0 and 128x4 bits (address 100h~17Fh) on bank 1.

* This specification are subject to be changed without notice.

12.25.2001 11

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