JPH06119467A - Microcomputer - Google Patents

Abstract

PURPOSE:To provide the microcomputer which can store a correct execution history especially applied for a development supporting device. CONSTITUTION:This microcomputer is provided with an external input/output interface part 104 for converting the voltage threshold value level of a developing device connected through an external input/output terminal group 108 to a voltage level judged by an internal CPU part 102 and to out put it, and an input/output control part 103 for controlling the input/output of an input/output execution history signal group 118 with an execution history storage circuit connected through a terminal group 109 for external input/output execution history and controlling the exchange of signals with the internal CPU part 102 and the exchange of signals with the external input/output interface part 104, a prescribed first power source is supplied through a power supply terminal 106 to the external input/output interface part 104, and a second power source outputted from the development supporting device is supplied through a power supply terminal 105 to the CPU part 102 and the input/output control part 103.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microcomputer, and more particularly to a microcomputer applied to a development support device.

[0002]

2. Description of the Related Art A block diagram of a conventional microcomputer is shown in FIG. In FIG. 4, the microcomputer 401 is composed of a CPU section 402, an input / output control section 403, and an external input / output interface section 404, and operates by receiving an input of a power supply voltage supplied from an external power supply terminal 405. CPU during normal instruction execution
When an input / output instruction is executed in the unit 402, C
Information is input and output through the PU signal group 411. In response to the received information, the input / output control signal group 413 is output to the outside of the microcomputer 401 via the control operation of the input / output control unit 403.
07 via the input / output control signal group 410, the external input / output interface section 404, the internal input / output signal group 409, and the external input / output terminal group 406.
Data is exchanged with the external input / output signal group 408.

FIG. 5 is a block diagram showing a development support device using the conventional microcomputer described above. Figure 5
As shown in FIG. 3, the development support device 501 includes a development device 506 including a microcomputer pseudo insertion unit 507.
Corresponding to the above, the microcomputer 401, the development support device power supply 502, the execution history storage device 503, the development device power supply detection unit 504, and the voltage conversion unit 505 are configured, and the connection form is mounted on the development device 506. Instead of the microcomputer, the development support device 501 is connected to the microcomputer pseudo insertion unit 507.
The microcomputer 401 installed in the development support device 501 is formed so as to operate in place of the microcomputer installed in the development device 506.
In this case, the power supply of the conventional development apparatus 506 is detected through the development apparatus power supply terminal 512, and the development apparatus power detection unit 505 determines whether or not there is a power input, and the development apparatus power detection unit 505 determines Power is supplied from the power supply 502 of the development support device to the external power supply terminal 405 of the microcomputer 401 via the power supply line 405. The external input / output signal group 408 and the external input / output control signal group 510 of the development device 506 are respectively the conventional development support device 50.
External input / output terminal group 406 in 1 and input / output control terminal group 4
It is connected to 07. To store the execution history,
The data of the external input / output signal group 408 is converted by the voltage conversion unit 505 via the execution history information signal 509 and written in the execution history storage circuit 503.

[0004]

The conventional microcomputer described above has a voltage level determined by the microcomputer and a storage device connected to the outside when the microcomputer is applied to a development support device. There is a drawback in that the voltage threshold value of 1 differs depending on the operating voltage input to the microcomputer and cannot be used as correct execution history data.

[0005]

The microcomputer of the first invention is incorporated in a development supporting device, which is provided with a power supply of the development supporting device, an execution history storage circuit, etc., corresponding to a predetermined developing device. In a microcomputer that performs input / output processing by converting a voltage threshold level of the development device connected through a predetermined external input / output terminal group into a voltage level that can be determined by an internal CPU unit. It controls the input / output of the input / output history signal group between the external input / output interface section for outputting and the execution history storage circuit connected via the predetermined external input / output execution history terminal group, and It controls input / output of an input / output control signal group to / from the development device connected via the input / output control terminal group, transmits / receives a signal to / from an internal CPU unit, and externally inputs / outputs the signal. Comprising an input-output control unit for controlling the signal transfer between the power interface unit, at least,
A predetermined first power source is supplied to the external input / output interface section via a first power source terminal, and
A second power supply output from the development support apparatus power supply is supplied to the CPU unit and the input / output control unit via a second power supply terminal.

Further, the microcomputer of the second invention is incorporated in a development support device, which is provided with a power supply for the development support device and an input / output data comparison circuit, corresponding to a predetermined development device, and is input / output. In a microcomputer for processing, the voltage threshold level of the development device connected via a predetermined external input / output terminal group is set to the internal CP.
Input / output between the external input / output interface section for converting to a voltage level that can be judged in the U section and outputting the voltage level, and the input / output data comparison circuit connected via a predetermined external input / output execution history terminal group. It controls the input / output of the output history signal group, and controls the input / output of the input / output control signal group with the development device connected via a predetermined input / output control terminal group, and also has an internal CPU section. Input / output for controlling the exchange of signals with the external input / output interface and for exchanging signals with the external input / output interface section, and also for receiving the interrupt signal dedicated to the development support device input from the external input / output interface section. A control unit, and supplies a predetermined first power source to the external input / output interface unit via a first power source terminal.
The PU unit and the input / output control unit are characterized by being supplied with a second power source output from the development supporting apparatus power source via a second power source terminal.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram of a first embodiment of a development supporting apparatus using a microcomputer 101 of this embodiment. is there. As shown in FIG. 1, the microcomputer 101 of this embodiment includes a CPU unit 102, an input / output control unit 103, and an external input / output interface unit 10.
It is composed of four. Further, as shown in FIG. 2, the development support apparatus 201 using the microcomputer 101 of the present embodiment corresponds to the development apparatus 205 including the microcomputer pseudo insertion unit 206, and the microcomputer 101 and the development support apparatus power supply. 202, an execution history storage device 203, and a development device power supply detection unit 204. The connection form is the same as in the conventional example, and instead of the microcomputer mounted in the development device 205, a microcomputer is used. The development support apparatus 201 is connected to the pseudo insertion unit 206, and the microcomputer 101 mounted in the development support apparatus 201 is formed so as to operate in place of the microcomputer mounted in the development apparatus 205.

In FIG. 1, a microcomputer 10
1 operates with the power supply voltage input from the external power supply terminal 106, but this power supply voltage fluctuates within the range of 2.7 to 7 [V]. On the other hand, the power supply voltage on the side of the development support device 201 is fixed at 5 [V]. Therefore, it is necessary to fix the power supply voltage corresponding to the side of the development support device 201, so that a predetermined dedicated power supply voltage is supplied from the dedicated power supply terminal 105 to the input / output control unit 103 and the CPU unit 102. To operate. Also, during normal command execution,
When an input / output instruction is executed in the CPU section 102, information is input / output via the CPU signal group 115.
A signal group that can be determined in the first execution history storage circuit 203 is output to the external input / output execution history terminal group 109 through the internal input / output force execution history signal group 118. The output external input / output history signal group 117 is written in the execution history storage circuit 203 without a voltage conversion function. Regarding the operations / actions of the external input / output terminal group 108, the external input / output signal group 110, the internal output signal group 111, the external input / output interface section 104, and the input / output control signal group 112, the microcomputer of the conventional example described above is used. It is similar to the case of 401.

FIG. 2 is a block diagram showing a development support device using the microcomputer 101 of the present invention as described above, but the difference from the conventional development support device described above is that of the conventional device of FIG. In the example, when the execution history is stored, the data of the external input / output signal group 110 is converted by the voltage conversion unit 505 via the execution history information signal group 509 and written in the execution history storage circuit 503. On the other hand, in the present embodiment, the dedicated power supply terminal 105 is used to output the voltage level that can be determined by the microcomputer 101 from the external input / output execution history terminal group 109. As a result, the execution history circuit 203 does not need to use the voltage conversion unit 505.
It is possible to write in.

FIG. 3 shows a microcomputer 1 according to the present invention.
It is a block diagram which shows the 2nd Example of the development support apparatus using 01. As shown in FIG. 3, the development support device 30
1 corresponds to the development device 305 including the microcomputer pseudo insertion unit 306 and corresponds to the microcomputer 10
1, development support device power supply 302, input / output data comparison circuit 3
03 and the development device power supply detection unit 304. The difference of this embodiment from the above-mentioned first embodiment is that
An input / output data comparison circuit 303 is provided in place of the execution history storage circuit 203 in the first embodiment of FIG. 2, and the voltage level that can be determined by the microcomputer 101 is set to the external input / output execution history terminal group. By outputting the data via 109, the input / output data comparison circuit 303 compares the output data, and the microcomputer 1
By outputting the development support apparatus dedicated interrupt signal 308 to the development support apparatus dedicated interrupt terminal 306 of 01, execution in the microcomputer 101 can be interrupted.

[0012]

As described above, according to the present invention, in a microcomputer having an external input / output signal group for performing input / output processing with the outside, by providing the external input / output execution history terminal group separately, the macro Even if the input / output processing is performed separately from the microcomputer instruction execution such as service, the execution history of the processing can be stored, and the data of the voltage level that can be processed in the microcomputer is stored in the above-mentioned By outputting from the external input / output execution history terminal group, there is an effect that execution history data similar to the voltage level determined in the CPU section is obtained and reliability is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a first embodiment of a development support device using this embodiment.

FIG. 3 is a block diagram showing a second embodiment of the development support device using this embodiment.

FIG. 4 is a block diagram showing a conventional example.

FIG. 5 is a block diagram showing an embodiment of a development support device using a conventional example.

[Explanation of symbols]

101, 401 Microcomputer 102, 402 CPU section 103, 403 Input / output control section 104, 404 External input / output interface section 201, 301, 501 Development support device 202, 302, 502 Development support device power supply 203, 503 Execution history storage circuit 204 , 304, 504 Development device power supply detection unit 205, 305, 506 Development device 206, 306, 507 Micro computer pseudo insertion unit 303 Input / output data comparison circuit

Claims (2)

[Claims] 1. A microcomputer which is incorporated in a development support device configured to include a power supply of a development support device, an execution history storage circuit, and the like, corresponding to a predetermined development device, and which performs input / output processing. An external input / output interface section for converting the voltage threshold level of the development device connected through the input / output terminal group into a voltage level which can be judged by the internal CPU section and outputting the voltage level, and a predetermined external input / output section. The development which controls input / output of an input / output history signal group to / from the execution history storage circuit connected via an output execution history terminal group and which is connected via a predetermined input / output control terminal group Controls input / output of an input / output control signal group to / from the device, and controls transmission / reception of signals to / from the internal CPU section and transmission / reception of signals to / from the external input / output interface section. An output control unit is provided at least, and a predetermined first power source is supplied to the external input / output interface unit through a first power supply terminal, and the external input / output interface unit is supplied to the CPU unit and the input / output control unit. The microcomputer supplies the second power output from the power supply for development support device through the second power terminal. 2. A microcomputer, which is incorporated in a development support device configured to include a power supply for a development support device, an input / output data comparison circuit, etc., corresponding to a predetermined development device to perform input / output processing. An external input / output interface section for converting the voltage threshold level of the development device connected via the external input / output terminal group into a voltage level that can be judged by the internal CPU section and outputting the voltage level; It controls the input / output of an input / output history signal group to / from the input / output data comparison circuit connected via the input / output execution history terminal group, and is connected via a predetermined input / output control terminal group. It controls input / output of an input / output control signal group with the development device, and controls transmission / reception of signals with an internal CPU unit and signals with the external input / output interface unit. And an input / output control unit for controlling acceptance of a development support device-dedicated interrupt signal input from the external input / output interface unit at the same time. A second power source is supplied from the development supporting apparatus power source via the second power source terminal to the CPU section and the input / output control section while supplying a predetermined first power source via the power source terminal. A microcomputer characterized by supplying a.