JPS6253866B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic desktop calculator (hereinafter referred to as "calculator") having a feature of place display.

2. Description of the Related Art Conventionally, there has been a calculator that adds a predetermined digit display to the display of entered numbers or calculation results to make it easier to understand the magnitude of the displayed numerical value.
However, in this conventional calculator, the above-mentioned digits are displayed only when displaying numbers with only an integer part, and when displaying numbers that include even one decimal digit, the above-mentioned digits are not displayed. It was something that was not done at all. Therefore, in the case of a numerical value that includes a decimal part, there is a problem in that the size of the displayed numerical value cannot be read at a glance.

The present invention has been made with the aim of solving the above problems, and it allows digits to be displayed even for numbers that include a decimal part, and for both numbers that include only an integer part and numbers that include a decimal part. , an attempt is made to provide a calculator that allows the size of displayed numerical values to be determined at a glance.

Hereinafter, the present invention will be explained in detail based on Examples.

FIG. 1 is a plan view showing the appearance of an embodiment of the present invention.

In the figure, 1 is a numerical key (decimal point key), 2 is a digit designation key, and 3 is a display section.

FIG. 2 is a diagram showing the display pattern of the display section.

31 is a Japanese character segment for displaying numbers, and is provided for 10 digits. 3
2 is a decimal point display segment, and 33 is a bank variation display segment. 34
is a segment for displaying "10,000" and is provided at the lower right of the upper six digits and the lowest digit. 35 is "billion"
This is a display segment and is provided at the upper right of the upper six digits and the lowest digit.

FIG. 3 is a block diagram showing the system configuration of this embodiment.

11 is a key, and 12 is an interface circuit. Further, 3 is a display section. Oscillation circuit 1
3 generates a clock signal for performing internal operations. Read-only memory (ROM) 1
Based on the instructions generated from 4,
Various operations are performed in an arithmetic logic unit (ALU) 15 and a random access memory (RAM) 16. The counter 17, the timing signal generation circuit 18, and the display RAM 19 are for generating display signals, and are connected to the display section (liquid crystal display) 3. Each bit of the display RAM 19 has a one-to-one correspondence with each segment of the display section 3, and when the bit content is "1", the corresponding segment lights up, and when the bit content is "0", the corresponding segment lights up. The segment goes out.

As shown in Figure 4, the RAM 16 consists of a total of 6 registers: 4 registers for calculations (X, Y, Z, V), 1 register for memory (M), and 1 register for flags (F). × 16 digits × 6 pieces =
384 bits). i is a counter for storing ``100 million'' display position, k is a counter for storing ``10,000'' display position, DD is a counter for storing decimal point position, F _p is a flag for storing 100 million key operations, F _M is 10,000 key operations or 10,000 keys. D is a flag that remembers that the state has become equivalent to operating the decimal point key, D is a flag that remembers that the state has become equivalent to operating the decimal point key, and F _i is a flag that displays "100 million". _Fk is a flag indicating that ``10,000'' is displayed; Q is a flag that is set by operating the 100,000 key or 10,000 key and reset by operating the next number key or decimal point key. Further, B ₁ , B ₂ , and B ₃ are input buffers.

FIG. 5 is a flowchart of a portion related to position display in this embodiment.

In the figure, "13" is a code for displaying a small 0. Further, for example, "N→X ₁ " indicates a process of inputting the input numeric code to the least significant digit X ₁ of the calculation/display register X.

The operation will be explained below based on the examples shown in FIGS. 6 to 8.

(1) In case of inputting "567890000" By operating number key "5", n ₂ → n ₃ → n ₂₃ →
The sequence proceeds as n ₂₄ → n ₂₅ → n ₂₆ → n ₂₇ → n ₂₈ → n ₁ , and "5" is input to the least significant digit X ₁ of register X and displayed. Next, when you operate the 100 million keys, n ₂ → n ₃ → n ₄ →
Proceeds as n ₅ → n ₆ → n ₇ → n ₈ → n ₉ → n ₁ , flags F _p , F
At the same time as _i and Q are set, "0" is input to counter i. This will display the lowest digit, ``billion''.

Next, when you operate the number key "6", n ₂ → n ₃
→n ₂₃ →n ₂₄ →n ₂₅ , and since the flag F _p is set, it advances as n ₂₅ →n ₆₆ , and then the flag Q
Since this is also set, the process from n ₆₇ onward is executed and the process returns to n ₁ . That _is , n ₆₇ resets _Q , n ₆₈ left _- shifts the contents of register Enter the code for displaying 0) into X ₁ to _{X 3} . Furthermore, at n ₇₁ input "4" into counter i, at n ₇₂ set flag F _i , at n ₇₃ input "0" to counter k, and at n ₇₄ set flag F _k .
Return to n ₁ . As a result, the display shown in the third row of FIG. 6 is performed.

Next, when you operate the number key "7", the sequence advances as n ₂ → n ₃ → n ₂₃ → n ₂₄ → n ₂₅ n ₆₆ , as in the previous case, but this time the flag Q has been reset, so n Proceeding to _{step 75} , it is determined whether the content of X ₃ is "13". In this case, "X ₃ = 13", so proceed to n ₇₆ , enter the code of number "7" in X ₃ , and return to n ₁ . Next, press the number key "8",
By operating "9", with n ₇₈ and n ₈₀ ,
A code for the number "8" and a code for the number "9" are respectively input to the register X, and a display as shown in the fourth row of FIG. 6 is performed.

(2) When inputting "12345.67".

By operating the number key "1", n ₂ → n ₃ → n ₂₃ →
The sequence proceeds as n ₂₄ → n ₂₅ → n ₂₆ → n ₂₇ → n ₂₈ → n ₁ , and "1" is input to the least significant digit X ₁ of register X and displayed. Next, when you operate the ten thousand keys, n ₂ → n ₃ → n ₄ → n ₅ →
The process progresses as n ₁₀ →n ₁₁ →n ₁₂ →n ₁₃ →n ₁₄ →n ₁₅ →n ₁₇ →n ₁₉ →n ₁ , flags F _M , F _k and Q are set, and "0" is input to counter k. be done. In addition,
At this time, the content of X ₁ is "1" and the content of X ₂ to X ₁₆ is "15" (suppress code), so the process proceeds as n ₁₅ → n ₁₇ → n ₁₉ → n ₁ . This will display the lowest digit "10,000".

Next, when you operate the number key "2", n ₂ → n ₃
→ n ₂₃ → n ₂₄ , and since the flag _FM is set, the process goes as n ₂₄ → n _41. Furthermore, since the flag Q is also set, the process from n ₄₂ onwards is executed, and the process returns to n ₁ . _{In other words, reset Q with n 42 ,} shift the contents _{of register} Enter ₁ to _X3 .
Furthermore, input "4" into the counter k at n ₄₆ , and n ₄₇
The flag F _k is set with . Next, at _n48 , it is determined whether the flag F _i is set or not, but in this case, "F _i = 0", so proceed as _n45 → _n50 and input "0" to the counter DD. do. This causes the display in the third row of FIG. 7 to be performed.

From then on, by operating the number keys "3", "4", and "5", the code for the number "3", the code for the number "4", and the code for the number "5" will be changed to X ₃ and X, respectively. ₂ , is input to _X1 , and the fourth row in FIG. 7 is displayed.

Next, when you operate the number key "6", n ₂ →
Proceed as n ₃ → n ₂₃ → n ₂₄ → n ₄₁ → n ₅₁ → n ₅₃ → n ₅₅ → n ₅₇ , execute the processing after n ₅₇ , and return to n ₁ . That is, at n _{57 ,} shift _the contents of register
At _n59 , the contents of counter k are counted up. Next, at _n60 , it is checked whether the flag F _i is set. In this case, since "F _i =0", the process proceeds from n ₆₀ to n ₆₂ and checks whether flag D is set. Since the decimal point key is not operated and "D=0", n ₆₂ → n ₆₃ →
The program proceeds as n ₆₄ →n ₁ , sets flag D, and inputs "1" to counter DD. This results in the display in the fifth row in FIG. Substantially the same process is performed by the subsequent operation of the number key "7", resulting in the display on the sixth row in FIG.

(3) When inputting "10000.3".

The process is the same as in case (2) above until ``10,000'' is displayed by pressing the ``1'' and ``10,000'' keys.

When the decimal point key is operated, the sequence advances as n ₂ → n ₃ → n ₄ → n ₉₀ , and since flag Q has been set, it advances to n ₉₁ and resets Q. Then, at n ₉₂ , it is determined whether the flag F _M is set or not. look. Since "F _M = 1"
Execute the processing after n ₉₃ . That is, after the contents of the register X are shifted to the left four times at _n93 , the code of the number "0" is input to _X1 to _X4 at _n94 . Further, at _n95 , "4" is input into the counter k, at _n96 the flag _Fk is set, and at _n99 it is checked whether the flag _Fp is set or not. Since "F _p =0", the process proceeds as n ₉₉ → n ₁₀₂ → n ₁₀₃ , inputs "0" into counter DD, sets flag D, and returns to n ₁ . This results in the display shown in the third row of FIG. 8.

Next, when you operate the number key "3", n ₂ → n ₃
→n ₂₃ , but since flag D has been set, the process advances to n ₃₄ and subsequent steps. That is, after the contents of the register X are shifted to the left once at _n34 , the code of number "3" is input to _X1 at _n35 , and the contents of the counter DD are counted up by "1" at _n36 . Next, at _n37 , it is checked whether the flag _Fk is set. Since "F _k =1", the contents of the counter k are counted up by "1" at _n38 . Furthermore
At _n39 , it is checked whether the flag F _i is set or not _.
= 0'', the process returns to _n1 . As a result, the display shown in the fourth row of FIG. 8 is performed.

The above has been explained in detail by taking the case of displaying the contents of a numeric value as an example, but in the case of displaying the calculation result (including the case of approximate number display), the digit position for displaying "10,000" or "billion" is displayed based on the decimal point position. It is only necessary to calculate the position and display that digit as ``10,000'' or ``100,000,000.''

Note that a configuration may be adopted in which segments for displaying "10,000" and segments for displaying "100,000,000" are provided corresponding to all digits of the display section.

As explained in detail above, the present invention provides an electronic desk calculator equipped with a display section that has a plurality of number segments and is capable of displaying multiple digits. For each number segment, a digit display segment (first digit display segment) representing a predetermined digit is added at the top, and a digit indicating a different digit from the one indicated by the first digit display segment is added at the bottom. A display segment (second place display segment) is added, and the digit display is moved between the first place display segments or the second place display segments in accordance with the numerical value displayed on the display section. Since the control means is provided to switch the digit display between the first display segment and the second display segment added to the same numeric segment, the number of a specific digit of the displayed numerical value is When moving due to a difference in the display mode of lower digit numbers, the digits can be displayed both before and after the movement, and furthermore, the first display segment and the second display segment segments are formed at different positions for the same number segment, so when providing similar digit display segments (for example, "thousand" and "ten", or "million" and "hundred", etc.), Misreading of the display can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the external appearance of an embodiment of the present invention, Fig. 2 is a diagram showing the display pattern of the display section in the embodiment, and Fig. 3 is a block diagram showing the system configuration of the embodiment. , Figure 4 shows the RAM shown in Figure 3.
16 is a block diagram, FIG. 5 is a flowchart of a portion related to position display in the same embodiment, and FIGS. 6 and 7 are
8 are diagrams showing key operations and displays when inputting "567890000,""12345.67," and "10000.3," respectively, in the same embodiment. Code 1: Number key (decimal point key), 2: Place designation key, 3: Display section, 31: Japanese character segment,
32: Decimal point display segment, 33: Punctuation display segment, 34: "10,000" display segment, 35: "100 million" display segment, 11: Key, 12: Interface circuit,
13: Oscillator circuit, 14: ROM, 15: ALU, 1
6: RAM, 17: Counter, 18: Timing signal generation circuit, 19: Display RAM.

Claims (1)

[Scope of Claims] 1. In an electronic desktop calculator equipped with a display unit that has a plurality of number segments and is capable of displaying multiple digits, for each of two or more number segments among the plurality of number segments, , a digit display segment (first digit display segment) representing a predetermined digit is added to the upper part, and a digit display segment (first digit display segment) representing a digit different from that indicated by the digit display segment is added to the lower part. 2nd place display segment) and move the digit display between the 1st place display segments or the 2nd place display segments in accordance with the numerical value displayed on the display section, or An electronic desktop calculator characterized by comprising a control means for switching display of digits between the first display segment and the second display segment added to the same number segment.