[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fd8yeU1H7Z_WAOACs898mofGCZpU99VTZLh8Rmfax6Ds":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":16,"related":17,"source":27,"type":28},[],"2023-10-24 22:57:27",101429685,[8,9,10,11],"Indicates the bottom of the stack","Indicates the top of the stack","Indicates the stack address","Indicates the stack length",{"courseId":13,"courseImg":14,"courseName":15},"eb511daf1489a300c9d9e7d40bb1da27","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff64008341fb41e10edc86ce33a862179.jpg","单片机原理与接口技术","The stack pointer SP of MCU is always ()",[18,29,38,47,56,65,68,77,86,95],{"answer":19,"createTime":5,"id":20,"options":21,"question":26,"source":27,"type":28},[],101429674,[22,23,24,25],"1\u002F12","1\u002F2","1","2","If the crystal frequency of 8051 single chip microcomputer is fosc= 12MHz, a machine cycle is equal to () s","v1",0,{"answer":30,"createTime":5,"id":31,"options":32,"question":37,"source":27,"type":28},[],101429677,[33,34,35,36],"Unit 00h, zone 0","Unit 01h, zone 0","Unit 09h, zone 0","SFR","After the MCU is powered on or reset, the working register R0 is in ()",{"answer":39,"createTime":5,"id":40,"options":41,"question":46,"source":27,"type":28},[],101429680,[42,43,44,45],"Accumulator","Arithmetic and Logic Unit","Program status word register PSW","DPTR","The carry flag CY is in ()",{"answer":48,"createTime":5,"id":49,"options":50,"question":55,"source":27,"type":28},[],101429682,[51,52,53,54],"External timer","External serial port","External interrupt","External crystal oscillator","XTAL1 and XTAL2 pins of 8051 are () pins",{"answer":57,"createTime":5,"id":58,"options":59,"question":64,"source":27,"type":28},[],101429683,[60,61,62,63],"0000H,00H","0000H,07H","0003H, 07H","0800H,00H","After 8051 reset, the value of PC and SP is ()",{"answer":66,"createTime":5,"id":6,"options":67,"question":16,"source":27,"type":28},[],[8,9,10,11],{"answer":69,"createTime":5,"id":70,"options":71,"question":76,"source":27,"type":28},[],101429687,[72,73,74,75],"00H","07H","81H","FFH","After reset, the direct address of stack pointer SP in internal RAM is ()",{"answer":78,"createTime":5,"id":79,"options":80,"question":85,"source":27,"type":28},[],101429689,[81,82,83,84],"00H-FFH","00H-07H","07H-7FH","08H-7FH","After 8051 MCU is powered on and reset, the maximum allowable range of stack area is () of internal RAM",{"answer":87,"createTime":5,"id":88,"options":89,"question":94,"source":27,"type":28},[],101429691,[90,91,92,93],"Output high level","Output rectangular pulse, frequency is 1 \u002F 6 of FOSC","Output low level","Output rectangular pulse, frequency is 1 \u002F 2 of FOSC","The ALE pin of 8051 is()",{"answer":96,"createTime":5,"id":97,"options":98,"question":103,"source":27,"type":28},[],101429693,[99,100,101,102],"Port P0","Port P1","Port P2","Port P0 and P2","When accessing the external memory or other interface chip, the data line and the low 8-bit address line are ()"]