JPH03192485A - Microcomputer ic with recognizing signal generating means - Google Patents

Abstract

PURPOSE:To easily identify function specification even after loading a microcomputer IC is loaded to a substrate by providing recognizing signal generating means, which are respectively prepared for the respective microcomputer IC by respective masks, and a recognizing signal output terminal. CONSTITUTION:In a program ROM 2 as the constituting element of a recognizing signal generating means 50, a recognizing signal area 21 is provided while being composed of pattern data various for the function specification. A microcomputer IC 1 generates a recognizing signal Pg various for the function specification. Thus, even when the different function specification is mixed after loading the microcomputer IC 1 to the substrate, the function specification can be easily identified only by observing the recognizing signal Pg to be outputted from a recognizing signal output terminal 13. Further, since it is not necessary to print an identification mark on the upper surface of a mold part variously for the function specification, it is made profitable for cost and a manufacture process.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a one-chip microcomputer IC in which components such as a program ROM are configured on the same chip, and in particular to a microcomputer IC that generates different recognition signals depending on the contents of the program ROM. Regarding IC.

[Prior Art] Conventionally, in a one-chip microcomputer IC in which components such as a program ROM are configured on the same chip, the program can be changed by simply changing a part of the mask used when creating the IC.

When mass-producing products using the microcomputer IC with multiple different functional specifications by changing the program using a mask, the microcomputer IC chips are distinguished by forming identification marks for each model on the surface as the mask is changed. However, since the shape of the board on which the microcomputer IC is mounted is exactly the same regardless of the model, it is very difficult to identify it. Therefore, by attaching some kind of identification mark to the board, identification of a plurality of models is performed. Hereinafter, the conventional technology will be explained according to the drawings.

Figure 2 shows a first conventional example in which an identification mark is attached to a board on which a microcomputer IC is mounted.
FIG. 2(b) is a top view of a board on which a microcomputer IC having a second functional specification is mounted, and FIG. 2(C) is a top view of a board on which a microcomputer IC having a third functional specification is mounted. Third
The figure shows a second conventional example in which an identification mark is attached to a board on which a microcomputer IC is mounted, and FIG. (b) is a top view of a board on which a microcomputer IC having a second functional specification is mounted, and FIG. 3(C) is a top view of a board on which a microcomputer IC having a third functional specification is mounted. 1st
An example and a second example will be explained.

In FIGS. 2(a), (b), and (c), 200 is a substrate, 1
00 is a mold part that covers the microcomputer IC bonded to the surface of the substrate 200 with resin, 51 is an identification mark for identifying the first functional specification, and 52 is an identification mark for identifying the second functional specification. , 53 are identification marks for identifying the third functional specification. identification mark 5
1.52.53 are drawn by printing on the upper surface of the mold part 100 after forming the mold part 100 on the substrate 200. In FIGS. 3(a), (b), and (c), 61 is an identification mark for identifying the first functional specification, 62 is an identification mark for identifying the second functional specification, and 63 is an identification mark for identifying the third functional specification.
This is an identification mark to identify the functional specifications of the product. The identification marks 61, 62, and 63 are drawn on the substrate 200 in advance as part of the wiring pattern. Therefore, in the first conventional example, the functional specifications of the microcomputer IC mounted on the board 200 can be identified by the positions and shapes of the identification marks 51, 52, 53, and in the second conventional example, the identification marks 61, 62, 63 The functional specifications of the microcomputer IC mounted on the board 200 can be identified by the shape.

[Problem to be solved by the invention]

However, printing the identification marks 51, 52, 53 on the upper surface of the mold part 100 as in the first conventional example is costly, and after forming the mold part 100, the identification marks 51, 52, 53 are printed on the upper surface of the mold part 100. If a board on which a microcomputer IC with the above-mentioned functional specifications is mounted is mixed in before printing, it will be very difficult to sort it out. Further, when the identification marks 61, 62, 63 are formed in advance as part of the wiring pattern on the board 200 as in the second conventional example, the microcomputer IC
After bonding, it can be easily sorted out even if it gets mixed in, but the wiring pattern must be changed in the manufacturing process of the board 200, which increases cost. Furthermore, since the boards 200 are different due to differences in functional specifications, parts cannot be standardized, which is disadvantageous in terms of cost and logistics in the manufacturing process. Further, in both the first conventional example and the second conventional example, the substrate 2
If microcomputer ICs with different functional specifications are mixed and mounted in 00, it will be very difficult to sort them.

An object of the present invention is to provide a means for easily identifying the functional specifications of a mounted microcomputer IC even after the microcomputer IC is mounted on the board 200.

[Means to solve the problem]

In order to achieve the above object, the present invention has the following configuration. That is, the microcomputer IC with recognition signal generation means according to the present invention is a microcomputer IC in which a plurality of ICs having the same basic configuration and different functional specifications by changing the program using mask options are manufactured, and each of the microcomputer ICs is individually controlled by each mask. Each microcomputer IC has a prepared recognition signal generation means and a recognition signal output terminal.
The recognition signal generation means is operated by power supply, and different recognition signals are outputted from the recognition signal output terminals.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a microcomputer I with recognition signal generation means according to the present invention.
FIG. 5 is a block diagram of the first embodiment of C. FIG. 5 is a top view of a board on which a microcomputer IC with recognition signal generating means according to the present invention is mounted. In FIG. 5, the same elements as those in the conventional example are designated by the same numbers and their explanations will be omitted.

1 is a microcomputer IC, which includes a program ROM 2, a microcomputer core 3, a recognition signal generating means 50 constituted by an output control circuit 4, a power supply terminal 10111, and a recognition signal output terminal 1.
3. It is configured to include a reset terminal 12. A component of the recognition signal generating means 50 is a recognition signal pg, which will be described later.
Except for generating , the microcomputer ICI performs normal operations. A battery 30 drives the microcomputer ICI by being connected to the power supply terminal 10.11. The program ROM 2 stores a program for realizing the functional specifications, and outputs program data Dp to the microcomputer core 3. Further, the program ROM 2 includes a recognition signal area 21, in which pattern data that differs depending on the functional specifications is written by changing the mask. The microcomputer core 3 generates control data Db according to the contents of the program data Dp from the program ROM 2, and controls the operation of each circuit in the microcomputer ICl. The output control circuit 4 is controlled by control data Db from the microcomputer core 3 and outputs a recognition signal Pg from a recognition signal output terminal 13. Also,
In FIG. 5, the microcomputer ICI is connected to the board 200.
When mounted on the board 200, the recognition signal generation terminal 13 is mounted on the board 200.
The recognition signal P is connected to the recognition signal output cover turn 8 formed on the top by a method such as wire bonding.
g is output to the recognition signal output cover turn 8.

Next, microcomputer I with recognition signal generation means having the above configuration
The operation of the first example of C will be explained.

FIG. 4 is a time chart for explaining the operation of the microcomputer IC with recognition signal generating means. After connecting the battery 30 to the power supply terminals 10 and 11, the microcomputer ICI starts operating when a reset signal Pr is input from the reset terminal 12 for a period of time L2 from time t1 as shown in FIG. 4(d). The contents of the program ROM 2 are sequentially input to the microcomputer core 3 as program data Dp, and the microcomputer core 3 operates according to the contents of the program data Dp. Note that the contents of the program data Dp differ depending on the functional specifications. When the program ROM 2 inputs the pattern data of the recognition signal area 21 to the microcomputer core 3 as program data Dp, the microcomputer core 3 outputs control data Db according to the pattern data Dp,
The output control circuit 4 is driven to output recognition signals P and g from the recognition signal output terminal 13. The pattern data Dp differs depending on the functional specifications, and therefore the recognition signal Pg also differs. The recognition signal Pg of the microcomputer ICI having the first functional specification is shown in FIG. 4(a), and the recognition signal Pg of the microcomputer IC having the second functional specification is
The recognition signal pg of the microcomputer IC1 having the third functional specification is shown in FIG. 4(b), and the recognition signal pg of the microcomputer IC1 having the third functional specification is shown in FIG. 4(c).

In FIG. 4(a), the start signal Ps is output from time t3 to time t4, and then the first signal P1 is output from time L5 to t6. Ps and Pl constitute a recognition signal Pg indicating the first functional specification. Figure 4 (b
), the start signal Ps and the first signal P1 are output by time t6 in the same way as in FIG. 4(a), and then at time t
The second signal P2 is output from 7 to t8. Ps, P.L.
, P2 constitute a recognition signal pg indicating the second functional specification. In FIG. 4(C), the start signal Ps, the first signal Pi, and the second signal P2 are output by time t, 8 in the same way as in FIG. 4(b), and then from time L9 tlOO
During this period, the third signal P3 is output. Ps, PI, P2, Ps
This constitutes a recognition signal pg indicating the third functional specification. That is, after connecting the battery 30 to the power supply terminals 10 and 11, when the reset signal Pr is manually applied from the reset terminal 12,
The microcomputer IC1 starts operating and outputs a different recognition signal pg from the recognition signal output terminal 13 depending on the functional specifications. When the microcomputer ICI is mounted on the board 200, the recognition signal pg, which differs depending on the functional specification and is output from the recognition signal output terminal 13, is output from the recognition signal output cover turn 8.

Further, in the first embodiment, the recognition signal P is output from the output control circuit 4.
Although the microcomputer IC with recognition signal generating means according to the present invention can be realized by controlling the pull-down or pull-up provided in the input circuit. A second embodiment will be described below based on the drawings.

Figure 6 shows a microcomputer IC with recognition signal generation means according to the present invention.
FIG. 2 is a block diagram of a second embodiment of the present invention. In FIG. 6, the same elements as those in the first embodiment shown in FIG. 1 are given the same numbers and their explanations will be omitted.

6 is an input circuit, and 71 is a pull amplifier control circuit, which pulls up the recognition signal output terminal 13 to Vdd in accordance with the control signal Db from the microcomputer core 3.

A pull-down control circuit 72 pulls down the recognition signal output terminal 13 to Vss in accordance with the control signal Db from the microcomputer core 3. The pull-up control circuit 71 and the pull-down control circuit 72 set the recognition signal output terminal 13 to the Vdd level or Vss level by performing pull-amplification or pull-down according to the control signal Db from the microcomputer core 3, create a recognition signal Pg, and output the recognition signal. It is output from terminal 13.

Next, a microcomputer IC with recognition signal generation means having the above configuration
The operation of the second embodiment will be explained.

When the program ROM 2 is input to the microcomputer core 3 using the pattern data of the recognition signal area 21 as the program data Db, the microcomputer core 3 receives the pattern data Dp.
The pull amplifier control circuit 7 outputs control data Dp according to
1 and the pull-down control circuit 72 to generate the recognition signal Pg.
is output from the recognition signal output terminal 13. That is, the fourth
In Figures (a), (b), and (C), normally only the pull-down control circuit 72 is operated by the control data Db from the microcomputer core 3 to set the signal to the Vss level, and the start signal Ps, first signal P1, When generating the second signal P2 and the third signal P3, only the pull-up control circuit 71 is operated by the control data Db from the microcomputer core 3 to set the signal to the Vdd level. It is possible to output the recognition signal pg.

That is, similarly to the first embodiment, the battery 30 is connected to the power supply terminal 1O.
111 and then input a recent signal Pr from the reset terminal 12, the microcomputer IC1 starts operating and outputs a recognition signal pg from the recognition signal output terminal 13, which varies depending on the functional specifications. The microcomputer ICI
is mounted on the board 200, the recognition signal output terminal 13
Recognition signal Pg that differs depending on the functional specifications output from
is output from the recognition signal output cover turn 8.

Therefore, in both the first embodiment and the second embodiment, the recognition signal output pattern 8 is measured using an oscilloscope or the like.
By observing the recognition signal pg output from the microcomputer ICI, the functional specifications of the microcomputer ICI can be easily identified.

Furthermore, in the second embodiment, the microcomputer ICI has both the pull-amplifier control circuit 71 and the pull-down control circuit 72 built-in, but only the pull-down control circuit 72 is built-in, and the recognition signal output cover 8 outputs the When observing the recognition signal Pg, a method may be used in which the recognition signal Pg is pulled up with a higher resistance value than the resistance value pulled down by an external pulldown control circuit. The same applies to the case where only the pull amplifier control circuit 71 is built-in.

〔Effect of the invention〕

As described in detail above, according to the present invention, the program ROM 2, which is a component of the recognition signal generation means 50, includes the recognition signal area 21 configured with pattern data different for each of the functional specifications. [
C1 generates a different recognition signal Pg for each functional specification. Therefore, even if the microcomputer ICI is mixed with different functional specifications after being mounted on the board 200, the recognition signal output terminal 13
The selection can be easily made by simply observing the recognition signal pg output from the . Furthermore, since the recognition signal Pg is an electric signal, it can be quickly and easily distinguished using a test device such as an IC tester, and the selection cost can be kept low. In addition, it is not necessary to print different identification marks for each specification function on the upper surface of the molded part 100 or make them as part of the wiring pattern of the board 200, as in the past, which reduces cost and manufacturing process. This will be advantageous in terms of logistics.

[Brief explanation of drawings]

FIG. 1 shows a microcomputer I with recognition signal generation means according to the present invention.
The block diagram of the first embodiment of C, FIG.
This is a first conventional example in which an identification mark is attached to a board on which C is mounted, and FIG. 2(a) is a top view of the board on which a microcomputer IC having the first functional specifications is mounted, and FIG. 2(b) is A top view of a board on which a microcomputer IC having a second functional specification is mounted;
FIG. 2(C) is a top view of a board on which a microcomputer IC having the third functional specification is mounted, and FIG. 3 is a second conventional example in which an identification mark is attached to a board on which a microcomputer IC is mounted. Figure 3 (a) is a top view of the board on which the microcomputer IC having the first functional specification is mounted, and Figures 3 (, b) are top views of the board on which the microcomputer IC having the second functional specification is mounted. Figure (c) is a top view of the board on which the microcomputer IC having the third functional specification is mounted, and Figure 4 is a time chart for explaining the operation of the microcomputer IC with recognition signal generation means.
Figure 5 shows a microcomputer IC with recognition signal generation means according to the present invention.
FIG. 6 is a block diagram of a second embodiment of a microcomputer IC with recognition signal generating means according to the present invention. l...Microcomputer IC. 13...Recognition signal output terminal, 50...Recognition signal generation means. fig.

Claims (1)

[Claims] In a microcomputer IC in which a plurality of ICs with the same basic configuration and different functional specifications are manufactured by changing programs using mask options, each microcomputer IC has a recognition signal generation means and a recognition signal output terminal prepared for each mask. 1. A microcomputer IC with a recognition signal generating means, wherein each microcomputer IC operates the recognition signal generating means by supplying power and outputs different recognition signals from the recognition signal output terminal.