单片机习题（国外英文资料）.docVIP

单片机习题（国外英文资料） The question 1 is a reference 1, fill in the blanks (25 points, 1 minute each time) The AT89S51 is an 8-bit chip machine The typical chips for McS-51 single-chip computers are 8031, 8051, 8751. The asynchronous communication port of AT89S51 is full duplex (simplex/half duplex/full duplex) AT89S51 has two levels of interrupts and five interrupts 5. AT89S51 internal data memory address range is 00 h ~ 7 fh, an address space of the byte address range is 20 h ~ 2 fh, corresponds to an address range is 00 h ~ 7 fh, maximum extension of external data memory capacity is 64 k. 6. AT89S51 instruction system way of addressing have __ register addressing __, directly addressing ____ _____ _____ register indirect addressing, _ addressing immediately _____ _____, base register index register addressing. If (A) = 34H, (R7) = 0ABH, execute XCH A. The result (A) = 0ABH, (R7) = 34H. 82C55 can extend 3 parallel ports, 8 of which have an operational function. When the single-chip machine is reset, PSW = 00 H, the current working register area is 0, and R4 corresponds to the storage unit address of 04 H. If the content in A is 67H, then the P mark bit is 1. 74LS138 is a three-input decoder chip that can select eight chips when the output is a selected signal. Two, judge the following instructions: (5 points) (1) MOV. (x) (2) INC DPTR; (fx) (3) DEC DPTR; (x) (4) CLR R0; (x) (5) MOV T0. (x) Third, short answer If (DPTR) = 507BH, (SP) = 32H, (30H) = 50H, (31H) = 5FH (32H) = 3CH, then follow the following instructions: POP DPH. POP DPL; POP SP; (DPH) = ___3CH___; (DPL) = ___5FH___; (SP) = ___50H___; (6) 2, using the 6MHz vibration, time 1ms, what should be the initial value of the timer mode 0? (please give us the calculation) (6 points) Solution: ∵ USES 6 MHZ crystal vibration ∴ machine cycle of 2 us 213 minus X times 2 times 10 minus 6 is 1 times 10 minus 3 ∴ X = 7692 (D) = 1 e0ch = 1, 1110, 0000, 1100 (B), In the form 0, the format is 1111, 0000, 1100 B Namely 0 f00ch To s