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EM73880 Datasheet(PDF) 6 Page - ELAN Microelectronics Corp |
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EM73880 Datasheet(HTML) 6 Page - ELAN Microelectronics Corp |
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6 / 40 page  6 * 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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