EM73962A
4-BIT MICROCONTROLLER
FUNCTION DESCRIPTIONS
PROGRAM ROM ( 16K X 8 bits ) for EM73962A
16 K x 8 bits program ROM contains user's program and some fixed data.
The basic structure of program ROM can be divided into 4 parts.
1. Address 0000h: Reset start address.
2. Address 0002h - 000Ch : 5 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.
address
0000h
0002h
0004h
0006h
0008h
000Ah
000Ch
000Eh
0086h
:
Bank 0 :
Reset start address
INT0; interrupt service routine entry address
TRGA
TRGB
TBI
Subroutine call entry address
designated by [LCALL a]
instruction
INT1
SCALL, subroutine call entry address
:
07FFh
0800h
0FFFh
1000h
Bank 1
Data table for
[LDAX],[LDAXI]
instruction
1FFFh
Bank 2
Bank 3
* This specification are subject to be changed without notice.
10.8.2001
3
ELAN [ ELAN MICROELECTRONICS CORP ]
