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<gmlj_ggb_ fh^_fu

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Ihjlu

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COM3.

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Ebgbb IRQ

Ebgbb aZijhkZ ij_ju\Zgby ebgbb IRQ, Interrupt ReQuest) — \_sv djZcg_ \Z`gZy ^ey ghjfZevghc jZ[hlu dhfivxl_jZ kf \j_adm

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qlh[u wlh]h g_ kemqbehkv

/

Qlh lZdh_ IRQ?

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dhlhjh_ ijhp_kkhj \uihegy_l khhl\_lkl\mxsb_ ^_ckl\by i_j_^Z_l dh^ gZ`Zlhc deZ\brb jZ[hlZxs_c ijh]jZff_

:gZeh]bqguf f_oZgbafhf ihevamxlky aZ]jm`_ggu_ \ iZfylv fZrbgu ijh]jZffu ^ey \aZbfh^_ckl\by ^jm] k ^jm]hf b k hi_jZpbhgghc kbkl_fhc Ij_ju\Zgby dhlhju_ hgb bkihevamxl ^ey wlhc p_eb gZau\Zxlky ijh]jZffgufb (software interrupts \ hlebqb_ hl ZiiZjZlguo (hardware interrupts k ihfhsvx dhlhjuo mkljhckl\Z dhfivxl_jZ h[f_gb\Zxlky kb]gZeZfb k ijhp_kkhjhf

:iiZjZlgu_ ij_ju\Zgby i_j_^Zxlky ih ki_pbZevguf dZgZeZf — ebgbyf IRQ AZ dZ`^uf ba mkljhckl\ aZdj_iey_lky k\hy ebgby b dh]^Z ijhp_kkhj keurbl kb]gZe gZijbf_j ih ebgbb IRQ hg lhqg__ dhffmgbdZpbhggZy ijh]jZffZ m`_ agZ_l qlh wlh hagZqZ_l mkljhckl\h ih^dexq_ggh_ d ihjlm KHF lj_[m_l d k_[_ \gbfZgby kdhj__ \k_]h hgh ohq_l h[f_gylvky k iZfylvx hq_j_^ghc ihjpb_c ^Zgguo Qlh[u \k_ jZ[hlZeh dZd qZku gm`gh g_ lhevdh gZkljhblv fh^_f gZ k\h[h^gmx ebgbx gh b mdZaZlv dhffmgbdZpbhgghc ijh]jZff_ ih dZdhc ba ebgbc `^Zlv kb]gZeh\ hl fh^_fZ

< jZkij_^_e_gbb ebgbc IRQ f_`^m ihke_^h\Zl_evgufb ihjlZfb kms_kl\m_l k\hy ljZ^bpby DZd ijZ\beh ihjl KHF bkihevam_l

,54 Z &20 — IRQ Gh qlh kZfh_ g_ijbylgh_ — ihjlu &20b

&20 dhlhju_ _keb g_ kqblZlv \gmlj_gg_]h fh^_fZ j_^dh dh]^Z [u\Zxl gm`gu \ ijbgpbi_ ^he`gu bkihevah\Zlv l_ `_ ^\_ ebgbb ij_ju\Zgby Z bf_ggh — ,54^ey&20b,54^ey&20

<hl ihq_fm g_ j_dhf_g^m_lky bkihevah\Zlv h^gh\j_f_ggh iZju ihjlh\ KHF b &20&20b &20— lZd dZd hgb kdhj__ \k_]h jZ[hlZxl gZ h^ghc IRQ KdZ`_f _keb \ZrZ furv ih^dexq_gZ d KHF lh fh^_f emqr_ \k_]h gZkljZb\Zlv gZ ihjlu &20 beb &20dhlhju_ bkihevamxl ^jm]mx ebgbx IRQ IjZ\^Z ^ey jZ[hlu k&20\Zf kdhj__ \k_]h ijb^_lky kgZqZeZ hldexqblv wlhl ihjl gZ ieZl_ \\h^Z-\u\h^Z — kf \j_adm gZ klj DklZlb dhgnebdl furb b fh^_fZ — h^gZ ba kZfuo jZkijhkljZg_gguo ijh[e_f ijb mklZgh\d_ ihke_^g_]h gZ dhfivxl_j

G_dhlhju_ fh^_fu iha\heyxl bkihevah\Zlv ^ey ihjlh\&20b &20 g_klZg^Zjlgu_ ebgbb IRQ — qZs_ \k_]h IRQ ^ey &20 b IRQ eb[h IRQ ^ey&20<hafh`gh wlh iha\hebl \Zf ba[Z\blvky hl dhgnebdlh\ i_jbn_jbcguo mkljhckl\ GZijbf_j _keb m \Zk ihklhyggh aZgylu KHF b&20fh`gh gZkljhblv fh^_f gZ&20 gh k bkihevah\Zgb_f ebgbb,54

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