6

* This specification are subject to be changed without notice.

EM73P461A

EM73P461A

EM73P461A

EM73P461A

EM73P461A

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

12.27.2001

Preliminary

Preliminary

Preliminary

Preliminary

Preliminary

PROGRAM ROM (8K X 8 bits)

PROGRAM ROM (8K X 8 bits)

PROGRAM ROM (8K X 8 bits)

PROGRAM ROM (8K X 8 bits)

PROGRAM ROM (8K X 8 bits)

8 K x 8 bits program ROM contains user's program and some fixed data .

The basic structure of program ROM can be divided into 6 parts.

1. Address 0000h: Reset start address.

2. Address 0002h - 000Ch : 6 kinds of interrupt service routine entry addresses .

3. Address 000Eh - 0086h : SCALL subroutine entry address, only available at 000Eh, 0016h, 001Eh, 0026h, 002Eh,

0036h, 003Eh, 0046h, 004Eh, 0056h, 005Eh, 0066h, 006Eh, 0076h, 007Eh, 0086h.

4. Address 0000h - 07FFh : LCALL subroutine entry address.

5. Address 0000h - 1FFFh : Except used as above function, the other region can be used as user's program region.

6. Address 1000h - 1FFFh : Fixed data stortage area.

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

008h

TRGB; Timer/counter B interrupt service routine entry address

LCALL entry address

00Ah

TBI; Time base interrupt service routine entry address

00Ch

INT1; External interrupt service routine entry address

00Eh

086h

800h

1000h

::

FFFh

Bank 1

fixed data area

1FFFh

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 table-look-up instruction.

Please note that fixed data only can be stored in 8K ROM Bank 1.

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

SCALL, subroutine call entry address

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

LDAX

LDAX

LDAX

LDAX

Acc

Acc

Acc

Acc

Acc

←

←

←

←

← ROM[DP]

ROM[DP]

ROM[DP]

ROM[DP]

ROM[DP]

L

L

L

L

L

LDAXI

LDAXI

LDAXI

LDAXI

LDAXI

Acc

Acc

Acc

Acc

Acc

←

←

←

←

← ROM[DP]

ROM[DP]

ROM[DP]

ROM[DP]

ROM[DP]

H

H

H

H

,DP+1

,DP+1

,DP+1

,DP+1

DP is a 13-bit data register which can store the program ROM address to be the pointer for the ROM code

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".