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EM73P461

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

ELAN Microelectronics 

EM73P461A

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

Preliminary

PROGRAM COUNTER (4K/8K ROM)

Program counter ( PC ) is composed by a 12-bit counter for 4K ROM/13-bit counter for 8K ROM which indicates

the next executed address for the instruction of program ROM.

For a 4K - byte size ROM, PC can indicate address form 000h - FFFh, for BRANCH and CALL instrcutions,

PC is changed by instruction indicating.

For a 8K - byte size ROM, PC can indicate address form 0000h - 1FFFh, for BRANCH and CALL instrcutions,

PC is changed by instruction indicating.

(1) Branch instruction:

SBR a

Object code: 00aa aaaa

Condition: SF=1; PC ← PC 11-6.a ( branch condition satisified )

PC Hold original PC value+1 a a a a a a

(for 4K/8K ROM)

SF=0; PC ← PC +1( branch condition not satisified )

PC

Original PC value + 1

LBR a

Object code: 1100 aaaa aaaa aaaa

Condition: SF=1; PC ← a ( branch condition satisified )

PC a a a a a a a a a a a a

(for 4K/8K ROM)

SF=0 ; PC ← PC + 2 ( branch condition not satisified )

PC

Original PC value + 2

SLBR a

Object code: 0101 0101 1100 aaaa aaaa aaaa (a : 1000 ~ 1FFFh)

0101 0111 1100 aaaa aaaa aaaa (a : 0000 ~ 0FFFh)

Condition: SF=1; PC ← a ( branch condition satisified )

PC a a a a a a a a a a a a

(only for 8K ROM)

SF=0 ; PC ← PC + 2 ( branch condition not satisified )

PC

Original PC value + 2

* This specification are subject to be changed without notice.

12.27.2001 9

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