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EM73880 Datasheet(PDF) 6 Page - ELAN Microelectronics Corp

No. de pieza EM73880
Descripción Electrónicos  4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
PDF  40 Pages
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Fabricante Electrónico  EMC [ELAN Microelectronics Corp]
Página de inicio  http://www.emc.com.tw
Logo EMC - ELAN Microelectronics Corp

EM73880 Datasheet(HTML) 6 Page - ELAN Microelectronics Corp

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* This specification are subject to be changed without notice.
EM73880
EM73880
EM73880
EM73880
EM73880
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
11.30.2001
Preliminary
Preliminary
Preliminary
Preliminary
Preliminary
PROGRAM COUNTER (8K ROM)
PROGRAM COUNTER (8K ROM)
PROGRAM COUNTER (8K ROM)
PROGRAM COUNTER (8K ROM)
PROGRAM COUNTER (8K ROM)
Program counter ( PC ) is composed by a 13-bit counter, which indicates the next executed address for the
instruction of program ROM.
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:
(1) Branch instruction:
(1) Branch instruction:
(1) Branch instruction:
(1) Branch instruction:
SBR a
SBR a
SBR a
SBR a
SBR a
Object code: 00aa aaaa
Condition: SF=1; PC
← PC
11-6.a ( branch condition satisified )
PC
Hold original PC value+1
aaaa
a
a
SF=0; PC
← PC +1( branch condition not satisified)
PC
Original PC value + 1
LBR a
LBR a
LBR a
LBR a
LBR a
Object code: 1100 aaaa aaaa aaaa
Condition: SF=1; PC
← a ( branch condition satisified)
PC
aaaaaaaaaaa
a
SF=0 ; PC
← PC + 2 ( branch condition not satisified )
PC
Original PC value + 2
For example: LDA x ; Acc
← RAM[x]
STA x ; RAM[x]
← Acc
(3) Zero-page addressing mode
For zero-page region, user can using direct addressing to write or do any arithematic, comparsion or bit
manupulated operation directly.
For example: STD #k,y ; RAM[y]
← #k
ADD #k,y; RAM[y]
← RAM[y] + #k



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