True or false. If your answer is false, please explain your reasons. () AD-type
ID: 2082965 • Letter: T
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True or false. If your answer is false, please explain your reasons. () AD-type Flip-Flop can be used as a latch that buffers the input signal. () All microcontrollers integrate CPU and I/O ports on a chip. () 8051 has only 8K memory space. () 8051 must connect to a crystal of 11.0592 MHz. Crystals of other frequency are not allowed. () Upon power-up, the 8051 fetches the first opcode from ROM address location 00F0H. () The 2's complement of FFH is 00H. () If a CPU has 24 address lines, and each address is for a byte; then 2G bytes can be directly addressed by the CPU. () A third-party vendor of a chip is a supplier that outside the (original) chip manufacturer, and the second manufacturer of the chip. That is, it is the third company (vendor) that can supply the chip. () If a conditional jump is not taken, the next instruction to be executed is the instruction that directly follows the jump instruction. () In the 8051, four ports are reserved for I/O ports. () A tri-state buffer enters the low-impedance mode when it is not enabled. () In a given byte-addressable computer, memory locations 1000H to 9FFFH are available for user programs. The total number of bytes for user programs is 8FFFH (in decimal).Explanation / Answer
(1) yes ( level triggered)
(2) Yes
(3) No it has 64k memory space
(4) Yes because it can be divided to give you exact clock rates for most of the common baud rates for the UART, especially for the higher speeds (9600, 19200). Despite the "oddball" value, these crystals are readily available and commonly used.
(6) No . 2's complement of FF H = 1 H
(9) yes this is a drawback of 8051. because Looping action with the instruction DJNZ Reg label is limited to 256 iterations only.
(10) Yes each have 8 bits
(11) No. Tri state buffer enters high imedance mode when it is disable. because When it activated into its third state it disables or turns “OFF” its output producing an open circuit condition that is neither at a logic “High” or “Low”, but instead gives an output state of very high impedance.
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