jlmao-微機(jī)原理-ch7-中斷系統(tǒng)-part2

1、Kunming University of Science & TechnologyPage 2Kunming University of Science & TechnologyPage 3Kunming University of Science & TechnologyPage 4Kunming University of Science & TechnologyPage 5圖圖8 11(a) 8259A芯片引腳芯片引腳12345678910111213142827262524232221201918171615VccA0INTAIR7IR6IR5IR4I

2、R3IR2IR1IR0INTSP/ENCAS2CSWRRDD7D6D5D4D3D2D1D0CAS0CAS1Vss8259AKunming University of Science & TechnologyPage 6Kunming University of Science & TechnologyPage 7Kunming University of Science & TechnologyPage 8數(shù)據(jù)數(shù)據(jù)總線總線緩沖器緩沖器讀讀/寫(xiě)寫(xiě)邏輯邏輯級(jí)聯(lián)級(jí)聯(lián)緩沖器緩沖器/比較器比較器中斷屏蔽寄存器中斷屏蔽寄存器 IMR控控 制制 邏邏 輯輯現(xiàn)行現(xiàn)行服務(wù)服務(wù)寄存器寄存器

3、ISR優(yōu)先級(jí)優(yōu)先級(jí)分析器分析器PR中斷中斷請(qǐng)求請(qǐng)求寄存器寄存器IRRCAS0CAS1CAS2內(nèi)部總線內(nèi)部總線CSINTAINTSP/ END0-D7IR0IR1IR2IR3IR4IR5IR6 IR7RDWRA0Kunming University of Science & TechnologyPage 9Kunming University of Science & TechnologyPage 10Kunming University of Science & TechnologyPage 11Kunming University of Science & T

4、echnologyPage 12Kunming University of Science & TechnologyPage 13Kunming University of Science & TechnologyPage 14Kunming University of Science & TechnologyPage 1512345678910111213142827262524232221201918171615VccA0INTAIR7IR6IR5IR4IR3IR2IR1IR0INTSP/ENCAS2CSWRRDD7D6D5D4D3D2D1D0CAS0CAS1Vss

5、8259AKunming University of Science & TechnologyPage 16【注意注意】：當(dāng)中斷得到響應(yīng)后，中斷輸入端必須及時(shí)撤出：當(dāng)中斷得到響應(yīng)后，中斷輸入端必須及時(shí)撤出高電平，否則在高電平，否則在CPU進(jìn)入中斷處理過(guò)程，并且開(kāi)中斷的情進(jìn)入中斷處理過(guò)程，并且開(kāi)中斷的情況下，原輸入端的高電平會(huì)引起第二次中斷的錯(cuò)誤。況下，原輸入端的高電平會(huì)引起第二次中斷的錯(cuò)誤。Kunming University of Science & TechnologyPage 17Kunming University of Science & Technology

6、Page 18Kunming University of Science & TechnologyPage 19Kunming University of Science & TechnologyPage 20Kunming University of Science & TechnologyPage 21Kunming University of Science & TechnologyPage 22Kunming University of Science & TechnologyPage 23Kunming University of Scienc

7、e & TechnologyPage 24Kunming University of Science & TechnologyPage 25Kunming University of Science & TechnologyPage 26Kunming University of Science & TechnologyPage 27Kunming University of Science & TechnologyPage 28Kunming University of Science & TechnologyPage 29213Kunming University of Science & TechnologyPage 30Kunming University of Science & Technolo