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单选题 If the crystal frequency of 8051 single chip microcomputer is fosc= 12MHz, a machine cycle is equal to () s
学科：单片机原理与接口技术
时间：2023-10-24 14:57:27
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题目1单选题
If the crystal frequency of 8051 single chip microcomputer is fosc= 12MHz, a machine cycle is equal to () sA. 1/12B. 1/2C. 1D. 2
题目2单选题
After the MCU is powered on or reset, the working register R0 is in ()A. Unit 00h, zone 0B. Unit 01h, zone 0C. Unit 09h, zone 0D. SFR
题目3单选题
The carry flag CY is in ()A. AccumulatorB. Arithmetic and Logic UnitC. Program status word register PSWD. DPTR
题目4单选题
XTAL1 and XTAL2 pins of 8051 are () pinsA. External timerB. External serial portC. External interruptD. External crystal oscillator
题目5单选题
After 8051 reset, the value of PC and SP is ()A. 0000H,00HB. 0000H,07HC. 0003H, 07HD. 0800H,00H
题目6单选题
The stack pointer SP of MCU is always ()A. Indicates the bottom of the stackB. Indicates the top of the stackC. Indicates the stack addressD. Indicates the stack length
题目7单选题
After reset, the direct address of stack pointer SP in internal RAM is ()A. 00HB. 07HC. 81HD. FFH
题目8单选题
After 8051 MCU is powered on and reset, the maximum allowable range of stack area is () of internal RAMA. 00H-FFHB. 00H-07HC. 07H-7FHD. 08H-7FH
题目9单选题
The ALE pin of 8051 is()A. Output high levelB. Output rectangular pulse, frequency is 1 / 6 of FOSCC. Output low levelD. Output rectangular pulse, frequency is 1 / 2 of FOSC
题目10单选题
When accessing the external memory or other interface chip, the data line and the low 8-bit address line are ()A. Port P0B. Port P1C. Port P2D. Port P0 and P2
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