JP2007288651A - A/d conversion method and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow a CPU to perform only processing of input channel specification and data reading to raise processing speed of the CPU by using a multi-control part. <P>SOLUTION: This A/D conversion method and device uses the multi-control part 9 which controls a multiplexing part (1), an A/D conversion part (2) and a data latch part (4) and the CPU (6) connected to the multi-control part (9), wherein the CPU (6) performs only channel specification to each analog input (1a-1n) and reading of digital data (3) to the data latch part (4). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an A / D conversion method and apparatus, and more particularly to a multiplex unit, an A / D conversion unit, and a multiplex control unit that controls operations of a data latch unit. The present invention relates to a novel improvement for reducing the burden on the CPU and improving the processing speed by only reading the digital data.

Conventionally, as this type of A / D conversion method and apparatus used, the configuration shown in FIG. 3 and FIG. 4 has been adopted, although patent documents and the like are not particularly shown.
That is, what is indicated by reference numeral 1 in FIG. 3 is a multiplex unit to which a plurality of analog inputs 1a... 1n are input, and 1 of analog inputs 1a to 1n designated by the multiplex unit 1 The input is A / D (analog / digital) converted by the A / D conversion unit 2 and latched as digital data 3 in the data latch unit 4.

  The CPU 6 to which the clock signal 5 is input is connected to the multiplex unit 1, the A / D conversion unit 2 and the data latch unit 4, and the multiplex unit 1 and the A / D conversion unit 2 in response to a command from the CPU 6. The data latch unit 4 is configured to control its operation.

  Next, in the above-described configuration, when the analog inputs 1a to 1n are specified sequentially or randomly in accordance with the program of the CPU 6, the CPU 6 is selected via the multiplex unit 1, and the A / D conversion unit 2 selects A. After being / D converted, the digital data 3 is read into the data latch unit 4 by a CPU read process.

Since the conventional A / D conversion method and apparatus are configured as described above, the following problems exist.
That is, in the above-described conventional configuration, when conversion processing is performed for each analog input for each input, the CPU performs all processing, so the CPU processing is performed due to the waiting time for conversion processing and the like. However, the processing speed of the entire A / D converter cannot be increased, and it is impossible to meet the demand for speeding up the processing speed.
That is, in the conventional configuration shown in FIG. 3, the processing operation of the CPU is performed as shown in FIG. 4, with input channel designation 10, A / D conversion start command 11, A / D conversion end detection 12, data latch command 13, Since all the data reading 14 is performed, it is impossible to increase the processing speed of the CPU.

  In the A / D conversion method according to the present invention, a plurality of analog inputs input to a multiplex unit are A / D converted by an A / D conversion unit, digital data is latched by a data latch unit, and the digital data is converted to the data In the A / D conversion method read from the latch unit, a multiplex unit, an A / D conversion unit, a data control unit that controls the data latch unit, and a CPU connected to the multiplex control unit, The CPU is a method of performing only the channel designation of each analog input input to the multiplex unit and reading the digital data into the data latch unit, and the data latch unit includes the number of inputs of the analog input. The A / D conversion apparatus according to the present invention is a method of using a plurality of analog signals input to a multiplex unit. In the A / D conversion apparatus in which the A / D conversion unit performs A / D conversion, the data latch unit latches digital data, and the digital data is read from the data latch unit, the multiplex unit, A A multi-control unit for controlling the / D conversion unit and the data latch unit, and a CPU connected to the multi-control unit, wherein the CPU specifies the channel designation of each analog input and the data input to the multiplex unit The digital data is only read into the latch unit, and the data latch unit is configured to use the number of analog inputs.

Since the A / D conversion method and apparatus according to the present invention are configured as described above, the following effects can be obtained.
That is, the operation of the multiplex unit, the A / D conversion unit, and the data clutch unit is performed by a multi-control unit provided separately from the CPU, and the CPU only performs input channel designation and data reading processing. The waiting time of the CPU can be eliminated, the processing can be simplified, and the processing speed of the CPU can be greatly improved.

  The present invention provides a multi-control unit that controls the operation of the multiplex unit, the A / D conversion unit, and the data latch unit, and the CPU only specifies the input channel and reads the digital data into the data latch unit. An object of the present invention is to provide an A / D conversion method and apparatus that reduce the burden on the CPU and improve the processing speed.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of an A / D conversion method and apparatus according to the present invention will be described with reference to the drawings. The same parts as those in the conventional example will be described using the same reference numerals.
In FIG. 1, what is indicated by reference numeral 1 is a multiplex section, and a large number of analog inputs 1 a to 1 n are input to the multiplex section 1.

  The analog inputs 1a to 1n selected by the multiplex unit 1 are A / D converted by the A / D conversion unit 2 and input to the data latch unit 4 as digital data 3, and the digital data 3 is input to the data latch unit 4 Is output as digital data 3.

  A CPU 6 to which a clock signal 5 is connected is connected to a multiplex control unit 9 to which the multiplex unit 1, A / D conversion unit 2 and data latch unit 4 are connected.

Next, the case where A / D conversion is performed in the configuration shown in FIG. 1 will be described.
As shown in FIG. 2, the CPU 6 performs only the designation 10 of the designated input channel among the analog inputs 1a to 1n and the data reading 14 of the digital data 3 to the data latch unit 4, and performs other A / D conversion. Since the start command 11, the A / D conversion end detection 12, and the data latch command 13 are all performed by the multi-control unit 9, the data processing speed by the CPU 6 can be significantly improved as compared with the conventional case.

1 is a block diagram of an A / D conversion method and apparatus according to the present invention. It is a flowchart which shows the process of CPU of FIG. It is a block diagram of the conventional A / D conversion method and apparatus. It is a flowchart which shows the process of CPU of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Multiplex part 1a-1n Analog input 2 A / D conversion part 3 Digital data 4 Data latch part 5 Clock signal 6 CPU
9 Multi-control unit 10 Input channel specification 14 Data reading

Claims (4)

Multiple analog inputs (1a to 1n) input to the multiplex part (1) are A / D converted by the A / D converter (2), and the digital data (3) is latched by the data latch part (4) In the A / D conversion method in which the digital data (3) is read from the data latch unit (4),
A multi-control unit (9) for controlling the multiplex unit (1), the A / D conversion unit (2) and the data latch unit (4), and a CPU (6) connected to the multi-control unit (9); The CPU (6) uses the channel designation (10) of each analog input (1a to 1n) input to the multiplex unit (1) and the digital data (3) to the data latch unit (4). ) Reading only.   2. The A / D conversion method according to claim 1, wherein the data latch section (4) uses as many inputs as the analog inputs (1a to 1n). Multiple analog inputs (1a to 1n) input to the multiplex part (1) are A / D converted by the A / D converter (2), and the digital data (3) is latched by the data latch part (4) In the A / D conversion device that reads the digital data (3) from the data latch unit (4),
A multi-control unit (9) for controlling the multiplex unit (1), the A / D conversion unit (2) and the data latch unit (4), and a CPU (6) connected to the multi-control unit (9); The CPU (6) includes a channel designation (10) of the analog inputs (1a to 1n) input to the multiplex unit (1) and the digital data (3) to the data latch unit (4). A / D converter characterized in that it is only read.   4. The A / D converter according to claim 3, wherein the data latch section (4) uses as many inputs as the analog inputs (1a to 1n).

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