EM73P461A datasheet(5/38 Pages) EMC

5 / 38 page

* This specification are subject to be changed without notice.

EM73P461A

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

12.27.2001

Preliminary

address

4096 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

008h

TRGB; Timer/counter B interrupt service routine entry address

00Ah

TBI; Time base interrupt service routine entry address

00Ch

INT1; External interrupt service routine entry address

00Eh

086h

FFFh

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 by two ways.

(1) Table-look-up instruction :

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

ROM code data.

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

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 777h by table-look-up instruction.

LDIA #07h;

STADPL

; DP3-0

← 07h

STADPM

; DP5-4

← 07h

STADPH

; DP8-6

← 07h, Load DP=0777h

LDL #00h;

LDH #03h;

LDAX

; ACC

← 6h

STAMI

; RAM[30]

← 6h

LDAXI

; ACC

← 5h

STAM

; RAM[31]

← 5h

ORG0777h;

DATA 56h;

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