EM73963A datasheet(6/38 Pages) EMC

6 / 38 page

* This specification are subject to be changed without notice.

6.14.2001

EM73963A

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

ZERO- PAGE:

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

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

Increment

Address

020h - 02Fh

0C0h - 0CFh

0D0h - 0DFh

0E0h - 0EFh

Level 0

Level 4

Level 8

Level 12

Level 1

Level 5

Level 9

Level 2

Level 6

Level 10

Level 3

Level 7

Level 11

Zero-page

000h - 00Fh

010h - 01Fh

0F0h - 0F3h

110h - 11Fh

160h - 16Fh

170h - 17Fh

100h - 10Fh

Bank 0

Bank 1

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