9

* This specification are subject to be changed without notice.

EM73P982

EM73P982

EM73P982

EM73P982

EM73P982

4-BIT MICROCONTROLLER

4-BIT MICROCONTROLLER

4-BIT MICROCONTROLLER

4-BIT MICROCONTROLLER

4-BIT MICROCONTROLLER

12.25.2001

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.

The 16Kx8 bits program ROM can be divided into 4 banks. There are 4Kx8 bits each bank.

The bank of the program ROM is selected by P3(1..0). The program counter is a 13-bit binary counter. The PC

and P3 are initialized to "0" during reset.

When P3(1..0)=00B, the bank0 and bank1 of program ROM will be selected. P3(1..0)=01B, the the bank0 and

bank2 will be selected. P3(1..0)=10B, the bank0 and bank3 will be selected.

Address

P3=xx00B

P3=xx01B

P3=xx10b

0000h

:

:

Bank0

Bank0

Bank0

0FFFh

1000h

:

:

Bank1

Bank2

Bank3

1FFFh

PROGRAM EXAMPLE:

BANK 0

START:

:

:

:

LDIA

#00H

; set program ROM to bank1

OUTA P3

B

XA1

:

XA :

:

:

LDIA

#01H

; set program ROM to bank2

OUTA P3

B

XB1

:

XB :

:

:

LDIA

#02H

; set program ROM to bank3

OUTA P3

B

XC1

:

XC :

:

:

BXD

XD :

:

:

:

; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

- -

BANK

1

XA1 :

:

:

BXA

:

XA2 :

: