JPS5853072A - Ram device - Google Patents

Abstract

PURPOSE:To make the program forming easy, by providing flags corresponding to a plurlaity of display data stored in an RAM area, and rewriting the flags with the program, and displaying display data of specified types. CONSTITUTION:An area of an RAM3 is divided into an X type display area 3A and Y type display area 3B and a flag set device 3 in 1-bit setting flags of ''1'', ''0'' is provided and the setting of flag is set with a program. Operation data from a computer is stored in a vacant area. Thus, display data of specified kinds can be displayed, no data rewrite at the change of display is done and the degree of freedom for RAM display area can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a RAM (Rand
om Access Memory) device.

This type of RAM device includes, for example, a display RAM device that stores two types of information: display data and calculation data from a combination unit.

As shown in FIG. 1, this display RAM device includes K, a display binary counter 1. Address decoder 2゜RAM3
, shift register 4. Latch 5. Write/read circuit 6
It is composed of etc. To explain this operation, in the case of writing data for display, the write/read circuit 6 is set to the write side, the binary counter for display is synchronized with IK, and the RAM 3 is accessed serially with the address by the address decoder 24C, and the data for display is is stored in RAM3.

When reading out the stored display data, the RAM 3 is serially accessed using addresses from the address decoder 2 in synchronization with the display binary counter 1, the display data is read out, and transferred to the shift register 4. Displayed through latch 5.

In this case, since the area of RAM3 where display data is stored is fixed, when changing the display, RAM3
The disadvantage was that the data in the display area had to be rewritten.

The present invention was made to eliminate the above-mentioned drawbacks, and its features include a RAM that stores multiple types of information;
an address decoder that specifies the address of llRAM;
The present invention includes means for setting a flag for selecting the type of information to be stored in the RAM, and the setting of the flag is performed by a program.

Hereinafter, the present invention will be described in detail along with examples.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention, and parts having the same functions as those in FIG. #I1 are given the same symbols.

In this embodiment, as shown in FIG. 2, the areas of the RAM 3 in FIG.
A 1-bit flag setting device 7 is provided to set flags of ``1'' and ``0'' in 8 sections, and this flag setting is set by a program.The calculation data from the computer is Store it in an empty area.

Since the write and successive output operations of this embodiment are basically the same as those shown in FIG. 1, their explanation will be omitted here.

Now, for example, if the 7th gear is rOJ, the data of the 3 people in the X type display area will be displayed one after another, and if the flag is rlJ, the data of the Y type display area □ rear 3B will be displayed one after another. If you want to change the display from type X to type Y, you only need to create a program that sets the flag to "1".

FIG. 3 is a block diagram showing the configuration of the RAM of another embodiment of the present invention, in which the RAM 3 of the embodiment of FIG. (
3D is an area for displaying the Z type, and the corresponding flags are set in the flag setting device 7 of a 2-bit register, for example.
', the W type display area is ro 0J, the X type display area is I'OIJ, and the Y type display area 4! r10J, Zl
l! l! Shown on z97! It is set as "11". The flag setting operation in this embodiment is performed by a program in the same way as in the embodiment shown in FIG.

As explained above, according to the present invention, by providing flags corresponding to multiple types of display data stored in the RAM area and rewriting them with a program,
Since the predetermined type of display data is displayed,
The degree of freedom of the RAM display area is increased, making it easier to create programs.

Additionally, if you want to change the content of display data in RAM, you can do so by simply setting and resetting flags.
It is valid.

[Brief explanation of drawings]

Figure 1 is a diagram showing an example of a display RAM device that stores two types of information, Figure 2 is a diagram showing the configuration of an embodiment of the present invention, and Figure 3 is a diagram showing an example of a display RAM device that stores two types of information. RA of the example of
It is a figure showing the composition of M. ! ...Binary counter for display, 2...Address data: ff-ta, 3...RAM, 4-...Shift register, 5...Latch, 6...Writing fist reading circuit,
7.7...Flag setting device.

Claims (1)

[Claims] A RAM for storing a plurality of types of information, an address decoder for specifying an address of the RAM, and means for setting a flag for selecting the type of information to be stored in the RAM, and the scissors flag can be set by a program. A RAM device characterized by: