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EM73201 Datasheet(PDF) 6 Page - ELAN Microelectronics Corp |
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EM73201 Datasheet(HTML) 6 Page - ELAN Microelectronics Corp |
6 / 30 page 6 * This specification are subject to be changed without notice. 7.20.1999 EM73201 4-BIT MICRO-CONTROLLER FOR GENERAL PURPOSE PRODUCT Preliminary 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 PROGRAM COUNTER (2K ROM) Program counter ( PC ) is composed by a 12-bit counter, which indicates the next executed address for the instruction of program ROM. For a 2 K - byte size ROM, PC can indicate address form 000h - 7FFh, 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 aaaa a 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 0 a a a a a a a a a a a SF=0 ; PC ← PC + 2 ( branch condition not satisified ) PC Original PC value + 2 (2) Subroutine instruction: SCALL a Object code: 1110 nnnn Condition : PC ← a ; a=8n+6 ; n=1..15 ; a=86h, n=0 PC 0 0 0 0 a a a a a a a a LCALL a Object code: 0100 0 aaa aaaa aaaa Condition: PC ← a |
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