In use, NOP instruction is usually used for short delay, and the delay time is usually in the order of machine cycle.
The possible delay times are as follows:
When operating a dot matrix screen like 12864, it is necessary to send an enable signal after the data signal is in place and stable. This settling time can be waited by several NOP instructions.
In high-speed serial communication, the timing relationship between clock and data pins of IIC is adjusted by NOP instruction.
What is the jumping cap of C5 1 microcontroller used for? Jumping caps is a simple way to realize different system functions.
It simplifies the design of PCB circuit board and is convenient to use.
In the microcontroller, what is the Du Bang wire used for? Generally used as a connecting line. If you buy a microcontroller development board, when using the development board, if you need to realize some functions, the instructions will tell you which two terminals to connect with Dubang cable. In addition, if you want to make your own control circuit, you can connect your own soldered circuit board with the pins of the development board expansion kit with Du Bang wire to realize debugging.
What is the program count written in the microcontroller for? Generally used for software counting. For example, sometimes a timer is used to time, but the maximum time of the timer exceeds 65 milliseconds when the external frequency is 12MHZ. If one second is not enough, you can design a timer to count 50 milliseconds, then count 20 times, and after 20 times, it will be 1 second.
5 1 microcontroller function If your function is Y_CS(void), then of course you can't write data, because your function itself declares a function with no parameters.
What is the function of display () in 5 1 single chip microcomputer? 5 1 itself does not have this function, but a subroutine defined by the programmer himself. Literally, display () is a subfunction of display.
What is the SBUF of 5 1 microcontroller? How many SBUFs does the 5 1 microcontroller have? If there are several SBUFs, how can the addresses all be 9H 1 and 5 1? The SBUF of the microcontroller is a data cache, which is used to send and receive data when communicating with the serial port. Users write transmission data into SBUF, which can be transmitted through serial port. The data received from the serial port is also temporarily stored in the SBUF and can be read from the SBUF after receiving the data.
2.5 1 the microcontroller has two SBUF, 1 receive SBUF, 1 send SBUF. Although the two SBUF addresses are the same, they are physically separated, and the hardware will automatically recognize the SBUF when the microcontroller sends and receives.
3. The two SBUF addresses are the same, but the microcontroller automatically chooses to receive SBUF when reading data, and automatically chooses to send SBUF when sending data.
What does the val function of vb do? Val function
Returns the number contained in the string, which is a numeric value of the appropriate type.
grammar
Val (string)
The required string parameter can be any valid string expression.
explain
The Val function stops reading the string at the first unrecognized character as a number. Symbols and characters that are considered as part of numerical values, such as dollar signs and commas, are not recognized. But functions can recognize decimal symbols &; O (octal) and&H (hexadecimal). Delete spaces, tabs, and line breaks from parameters.
The following return values are 16 15 198:
Val ("1615198 street northeast")
In the following code, Val returns the decimal value of the hexadecimal value shown-1.
val(" & amp； HFFFF”)
Note that the Val function only deals with periods (. ) as an available decimal separator. When different decimal separators are used, such as in international applications, CDbl is used to convert strings into numbers.
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Val function example
This example uses the Val function to return the numeric value contained in a string.
Blur my value
MyValue = Val("2457 ")' returns 2457.
MyValue = Val(" 2457 ")' returns 2457.
MyValue = Val("24 and 57 ")' gives 24.
Sst89e5 16 5 1 microcontroller simulation chip/emulator, what is it used for? With the simulation chip, you can execute the program step by step and understand the changes of each step. In order to find the problems in the program more conveniently. The price chip seems to be more than 20 pieces, I can't remember.
5 1 microcontroller initialization function. That's your own initialization function. You can write what you want to initialize in it.