EM73880 datasheet(4/40 Pages) EMC

4 / 40 page

* This specification are subject to be changed without notice.

EM73880

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

11.30.2001

Preliminary

address

8192 x 8 bits

000h

Reset start address

002h

INT0; External interrupt service routine entry address

004h

HTCI; High speed timer interrupt service entry address

006h

TRGA; Timer/counterA interrupt service routine entry address

LCALL entry

008h

TRGB; Timer/counter B interrupt service routine entry address

address

00Ah

TBI; Time base interrupt service routine entry address

00Ch

SPI

00Eh

086h

800h

FFFh

fixed data area

Bank1

1FFF

User's program and fixed data are stored in the program ROM. User's program is according the PC value

to send next executed instruction code . Fixed data can be read out.

The program counter is a 13-bit binary counter. The PC can defined 8K ROM.

Table -look-up instruction is depended on the Data Pointer (DP) to indicate to ROM address, then to get the

ROM code data. The fixed data only can be put in bank1.

LDAX

Acc

←

← ROM[DP]

ROM[DP]

LDAXI

Acc

←

← ROM[DP]

ROM[DP]

H,DP+1

,DP+1

DP is a 12-bit data register which can store the program ROM address to be the pointer for the ROM code

1000

SCALL, subroutine call entry address

data. First, user load ROM address into DP by instruction "STADPL, STADPM, STADPH", then user can

get the lower nibble of ROM code data by instruction "LDAX" and higher nibble by instruction "LDAXI"

PROGRAM EXAMPLE: Read out the ROM code of address 1777h by table-look-up instruction.

LDIA #07h;

STADPL

; DP2-0

← 07h

STADPM

; DP5-3

← 07h

STADPH

; DP8-6

← 07h, Load DP=777h

LDL #00h;

LDH #03h;

LDAX

; ACC

← 6h

STAMI

; RAM[30]

← 6h

LDAXI

; ACC

← 5h

STAM

; RAM[31]

← 5h

;

ORG 1777H

DATA 56H;

DATA RAM ( 244-nibble )

There is total 244 - nibble data RAM from address 00 to F3h

Data RAM includes 3 parts: zero page region, stacks and data area.

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