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EM73PA88ABQ

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

ELAN Microelectronics 

Bank 0

EM73PA88A

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

Preliminary

Increment

Address

000h - 00Fh

Zero-page

010h - 01Fh

020h - 02Fh

:

:

:

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

100h - 10Fh

110h - 11Fh

:

:

:

ZERO- PAGE:

1E0h - 1EFh

1F0h - 1FFh

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

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

PROGRAM EXAMPLE: To write immediate data "07h" to RAM [03] and to clear bit 2 of RAM [0Eh].

STD #07h, 03h ; RAM[03] ← 07h

CLR 0Eh,2 ; RAM[0Eh]2 ← 0

STACK:

There are 13 - level (maximum) stack levels that user can use for subroutine (including interrupt and CALL).

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

When an instruction (CALL or interrupt) is invoked, before enter the subroutine, the previous PC address

is saved into the stack until returned from those subroutines, the PC value is restored by the data saved

in stack.

DATA AREA:

Except the area used by user's application, the whole RAM can be used as data area for storing and loading

general data.

ADDRESSING MODE

The 500 nibble data memory consists of two banks (bank 0 and bank 1). There are 244x4 bits (address

000h~0F3h) in bank 0 and 256x4 bits (address 100h~1FFh) in bank 1.

* This specification are subject to be changed without notice.

10.8.2001 9

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