KR580IK80A in an amateur display. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Digital technology

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We bring to the attention of radio amateurs a CW and RTTY signal processing unit based on the KPS80MK80A microprocessor. Its difference from previous devices is that the task of decoding CW and RTTY signals will be solved in it by modern means of microprocessor technology (ie, software, not hardware).

The purpose of this development was the desire to show the advantage caused by the use of a microprocessor in devices where rigid logic is traditionally used, for example, in a CW and RTTY signal processing unit [1]. It lies in the fact that many tasks that are solved in them by hardware can be implemented by an appropriately compiled program.

The described design with a program stored in ROM is a telegraph signal processing unit and is an integral part of an amateur display, the block diagram of which is shown in Fig. 1. The CW interface and the display module are taken from [2] and [3], respectively, without any alterations

(click to enlarge)

Figure 2 shows a schematic diagram of the processing unit. It consists of a clock generator on a DD1 chip, a ROM (DD3, DD6), an input port (DD4, DD5), and a microprocessor DD2.

The CW signal processing program (compiled and debugged using the Micro-80 microcomputer) is located in the DD3 chip and consists of the following parts:

Table 1

Chip DD6 is redundant and is provided to store an additional program, such as processing RTTY signals or a Morse code sensor (when connecting the keyboard described in [4J).

The CW signal processing algorithm and all the main parameters are the same as those given in [1]. Besides. The use of a microprocessor made it possible to programmatically implement a cursor and self-test of the processing unit (by calculating the checksum in ROM), as well as improve the visual perception of information. The codes for programming the ROM are shown in the table.

When repeating the processing block, if the radio amateur does not have the KR580GF24 chip at his disposal. instead, you can use a clock pulse generator made on the K155 series microcircuits. The diagram of this generator is shown in fig. 3.

Positional designations of all newly introduced elements are given with a stroke. The timing diagram of the generator operation is shown in fig. 4. Instead of microcircuits KR556RT5 (DD3.DD6), you can use any other programmable ROM. But with any change in the processing unit (for example, when installing ROM chips of a different type), it should be remembered that the load capacity of the microprocessor is 2 mA.

It is advisable to install ROM chips DD3 and DD6 in sockets. This will make it easier to change the program (by replacing the ROM).

If the processing unit will be used in conjunction with the display module described in [5]. in the latter, counters D37, D38, D39 must be excluded. The main address of the processing unit from the 0th to the 9th bit is connected through inverters (K155LAZ or K155LN1), respectively, to pins 4 and 12 of the D34 chip. 4 and 12 D35. 4 and 12 D36, 4 and 12 D32, 4 and 12 D33. The output of 3P3U is connected to the "Input of the recording pulse".

A properly assembled processing unit does not require adjustment and starts working immediately.

For those who are dealing with a microprocessor for the first time, it is advisable to assemble and test the processing unit in stages. But before that, the power supply and the display module must already be manufactured.

In the processing unit, a clock generator is first assembled. When you press the SBI button, a logic level of 1 should appear at pin 1 of the DD1 chip. At pins 10 and 11 of DD1, pulses with an amplitude of 12 V are constantly present.

Then install the DD2 chip and all the resistors and connect the display module. After pressing the "Reset" button, the TV screen should be evenly filled with the symbols "space" and "9". At the same time, the microprocessor generates the "EPROM" signal and sequentially changes the address. If this does not happen, it is necessary to eliminate the short circuit (open circuit) in the address (data) highway.

After that, all the remaining elements are turned on and the operability of the processing unit is checked. After pressing the "Reset" button, the message "CW READY" should appear on the screen, which indicates the health of the manufactured block.

In conclusion, it should be noted that the described processing unit can be used wherever it is necessary to convert serial information (with a frequency of up to 200 Hz) into parallel.

To improve the reliability of the described device, it is advisable to replace the K155LA7 (DD3') chip with K155LH5 or K155LA11.

Literature

1. Bagdyan V. Processing unit for CW and RTTY signals. Radio, 1982. No. 8, p. 17 20.
2. Bagdyan V. CW interface to an amateur display. Radio, 1983, No. 8. p. 19-20.
3. Zelenko G., Panov V., Popov S. Display module. Radio. 1983. No. 7, p. 23-27.
4. Zelenko G., Panov V, Popov S. Display module. Radio, 1983, No. 8. p. 26-27.
5. Bagdyan V. Amateur display. - Radio, 1982. No. 10. With. 19-24.

Authors: A. Pokladov, Y. Konstantinov (U050JL), Chisinau; Publication: N. Bolshakov, rf.atnn.ru

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