JPH02252030A - Microcomputer development supporting device - Google Patents

Abstract

PURPOSE:To prevent a pin from being damaged, to prevent the device from being dropped at its reliability and to reduce the manhour of replacement by providing a probe with a mechanical switching means, and executing the prescribed control of probe connection. CONSTITUTION:The probe in a user system is provided with the mechanically switchable means 8 to optionally switch the pin 5 of the probe in the user system to the IC socket 4 of a microprocessor CPU or to the pod connecting connector 6 of an insertion emulator. Since replacement is unnecessary by such constitution, the connection pin can be prevented from being damaged and the reliability of the microcomputer development supporting device can be improved and the manhour of replacement can be reduced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a microcomputer development support device, and
The present invention relates to a probe connected to a user system CPU socket using a microprocessor (CPU).

[Conventional technology]

FIG. 4 is a perspective view showing a conventional CPU board. In FIG. 1, a microprocessor (CPU) 9, a probe 10 of an in-circuit emulator pod (hereinafter referred to as POD), a CPU IC socket 11 of a user system, and a CPU board 12 of the user system are shown. ing.

When emulating using an in-circuit emulator, the length of the cable between the user system and the bot cannot be ignored, and this cable causes a time delay compared to the operation of the CPU 9. For this reason, even if the CPU9 operates when inserted into the user system, the PO
There is a possibility that it will not work when the probe 10 of D is connected. Therefore, in order to distinguish whether it does not work due to a bug in the user system or the time delay mentioned above, we will compare the operation when the CPU 9 is inserted into the user system and the PO
It is necessary to compare the operation when the probe 10 of D is connected.

Conventional user system CPU socket IN
When comparing the operation of the user system when POD 9 is inserted and the operation when POD prologue 10 is connected,
As shown in Figure 4, CPU 9 and POD probe 1
0 and the socket 114 of the user system was replaced (it was negative).

[Problem to be solved by the invention]

The inser kit emulator using the conventional probe described above is installed in the CPU socket 11 of the user system.
．． When comparing the operation when C, PU 9 is connected and the operation when POD probe 10 is connected, CPU 9 and P
OD probe 10 and user system socket II
J has to be replaced every time, and if the number of replacements is large, the CPU 9 and the probe 10 bottle are often damaged, resulting in a decrease in reliability.

An object of the present invention is to provide a microcomputer development support device that solves the drawbacks mentioned above, prevents a decrease in reliability, and reduces the number of man-hours required for replacement.

[Means to solve the problem]

The configuration of the micro combinator development support device of the present invention is as follows:
Connect the microprocessor to the socket of the user system, or use the inner kit emulator
The probe is characterized in that the probe is equipped with a switching means for selecting whether to connect the probe or not.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a circuit diagram showing a microcombination development support device according to a first embodiment of the present invention. Referring to Figure 1,
In the device of the first embodiment, a switching means 1 consisting of two two-man-powered AND gates and one OR gate selects which of the CPU and POD is connected to the user system; An input signal 2 for switching this switching means 1 is applied via an inverter to the CPU, :PO
An OR element 3 for holding the side not connected to the user system in the DO, an IC socket 4 for inserting the CPU, a 10-bubin 5 for connecting to the user system, and a POD. It includes a connector 6 for connecting to a microcomputer development support device,
configured. Furthermore, the output signal 20 from the CPU, which does not become high impedance during hold, and the -
The output signal 21 from POD that does not become high impedance, the output signal 22 from CPtJ and I'OD that becomes high impedance during hold, and the output signal 22 from CPtJ and I'OD, CF
'Input to U and POD 23, CPU and POD
In order to connect the data signal 24 of D and the output signal of the CPU to the probe bin 5#-) 4g No. 25 and P
A signal 26 for connecting the output signal from the OD to the probe bin 5, a signal 27, 29 for placing the side of the CPU or POD that is not connected to the probe bin 51 in a hold state, and a CPU (! : Signal 28 for holding both POD and CP[J/P
The switching means 1 is controlled by using ODO No. 2 as input.
A logic circuit 30 is shown for inputting the data.

Here, the switching means 1 is switched by an input signal 2 which is an input for selecting CPU or POD (hereinafter referred to as CPU/POD). That is, the input (CP
When the U/1) OD) signal 2 is "H", one of the AND elements connected to the microprocessor IC socket 4 side of the logic circuit of the switching means 1 becomes active, and the input from the IC socket 4 becomes active. When active, the output of the user system becomes active, i.e. I
This means that the C socket 4 and the probe bin 5 are connected. Next, when the input signal 2 is @L'', one input of the AND element connected to the POD connector 6 of the switching means 1 becomes active, and at this time, when the input from the POD connector 6 becomes active. , the output to the user system becomes active. That is, this means that the POD connector 6 and the probe bin 5 are connected. However, it is assumed that one source of this switching means 1 is supplied from the POD side.

Next, OR element 3 is an element that is used to put the side of CI'U and POD that is not connected to the user system into a hold state. That is, when the input signal 2 is high, the IC socket 4 side is connected to the user system, and one input of the OR element 3 connected to the POD side connector 61 of the OR element 3 becomes active, and the PO
D goes into a hold state. Furthermore, when the input signal 2 is "L", the POD side connector is connected to the user system, one input of the OR element 3 connected to the IC socket 4 becomes active, and the CPU is held. State I.

In this way, the unconnected side of the CPU and POD enters the hold state, so that the high
Regarding the output terminal I which is in an impedance state, the logic circuit of the switching means 1 is unnecessary, and the input terminal does not operate even if the CPU or PODI input is in the hold state, and there is no risk of damage. Since the switching means 1 is not necessary, the switching means 1 is actually required only for the output terminals that do not go into a high impedance state during hold. However, when releasing the hold,
Since the CPU and POD hold the state before being held, if you want to start from the initial state, you need to reset it by -degrees.

In this embodiment, when the CPU and POD probes are to be replaced on the CPU socket 4 of the user system, the CPU and POD probes can be replaced only by switching the switching means 1 without taking the trouble of replacing the CPU and POD probes.
The probe D can be replaced, thereby greatly reducing the probability of damaging the CPU and pin 5 of the probe, improving reliability, and reducing the number of man-hours required for replacement.

FIG. 2 is a circuit diagram of a micro combinator development support device according to a second embodiment of the present invention. In Figure 2, real silk 2
In this embodiment, the logic circuit (switching means 1) of the first embodiment is replaced with a mechanical switching means 8. In this case, the switching means 1 as in the first embodiment is replaced with a mechanical switching means 8. This has the advantage of not requiring a secondary power supply and simplifying the circuit.

However, in the case of such a mechanical switching means 8, a large current may be generated at the moment of switching, and this
If it flows into the PU, it may destroy it. Therefore, when changing the switch, it is necessary to turn off the power to the user system. In addition, CPU/IC socket 4. Probe pin 5. The connector 6 is similar to the first embodiment.

Also, as in the first embodiment, between the CPU and POD,
Since it does not have a circuit to hold the unconnected terminals, it is necessary to connect all the terminals to the switching means 8.

FIG. 3 is a perspective view illustrating the effect of the embodiment shown in FIG. 1. In FIG. 1, the microcomputer support 1t13 is equipped with a selection device 14 for selecting whether to connect a CPU or a POD to the user system, and is used when connected to a socket on the CPU board 12 of the user system. By switching the selection device 14, the input signal 2 in FIG. 1 changes. Further, the cable 15 is for connecting the microcomputer development supporting device 13 and the POD.

〔Effect of the invention〕

As explained above, the present invention provides a user system with a C
The operation when a CPU is inserted into the PU IC socket and the P
When comparing the operation when the OD is connected, conventionally, as shown in Figure 3, the probes for the CPU and POD were replaced with 11 Nyzax stem CPU IC sockets, but as shown in Figure 4. Since the comparison can be made only by switching the switching means, it is possible to prevent damage to the probe pins of the CPU and POD.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a micro combinator development support device according to a first embodiment of the present invention, FIG. 2 is a circuit diagram of a micro combinator development support device according to a second embodiment of the present invention, and FIG. 11C1 is a perspective view when in use, and FIG. 4 is a perspective view comparing the operation when a CPU is inserted into a user system using a conventional probe and the operation when a POD is connected. 1...--Logic circuit for switching means, 3...
・OR element for processing hold signal, 4...CP
IC socket for U, 5... Probe bin for connecting the user system, G... In-circuit e emitter, connector for connecting the controller to the bonnet, 8... Mechanical Cutting means, 9...Microprocessor (CP(J), 10...Inser-git emulator globe, 11...I for CPU
C socket, 12... CP of user system team
U board, 13...Microcomputer development support device, 14...Switching means, 15...
...Bod/probe connection cable, 2,20. to 29...signal, 30...logic circuit. Agent Patent Attorney Susumu Uchihara 4th

Claims (1)

[Claims] A microcomputer development support device characterized in that the probe is equipped with a switching means for selecting whether to connect a microprocessor to a socket of a user system or a probe of an in-circuit emulator.