JPS6260341A - Semiconductor integrated circuit for telephone set - Google Patents

Abstract

PURPOSE:To prevent a call from being a wrong call when an address not written is called in error by writing a data end code (end code) to the 1st one digit or several digits of a telephone number at application of power. CONSTITUTION:A RAM 6 with an initializing signal input terminal is placed to the 1st digit or plural several digits of each telephone number storage address and the rest of the entire memory consists of a conventional RAM 7. An output 9 of a pulse generating circuit 8 is inputted to the RAM 6. The output 9 is inputted also to a control circuit 10 to initialize the control section. The output 11 of the memory is inputted to an output generating circuit 13 and an end code detection gate 14 from a READ/WRITE buffer 12. The output 15 of the detection gate 14 is inputted to a control circuit 10, and outputs 16-18 of the circuit 10 are inputted respectively to the output generating circuit 13, the buffer 12 and an address counter 1. As a result, when an end code is detected at the output of the RAM, the output, the read of the RAM and the increment of the address counter are stopped immediately.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a telephone dialer-semiconductor integrated circuit (hereinafter referred to as dialing function O), i or an integrated circuit with a built-in dialing function (hereinafter referred to as IO). Regarding.

[Summary of the invention]

This invention provides a rewritable semiconductor memory device c and below RA.
Called M] Fully built-in dialer-I that stores all phone numbers
In an IO with a built-in C or similar dial function,
By writing a data end code C (hereinafter referred to as an end code) in the first digit or multiple digits of the telephone number when the power is turned on, it prevents an incorrect call from being made when an address with a pre-existing address is called by mistake. It is.

[Conventional technology]

When conventional telephone dialer ICs have a memory, there are those in which the memory is cleared manually each time the power is turned on, and those in which the memory is accessed and initialized by software.

[Problem that the invention seeks to solve]

However, manually clearing the memory is troublesome, and there is a possibility that an erroneous operation may occur. In addition, in order to initialize the memory using software, the operation of accessing the memory money while changing the address and running the initialization booter must be repeated as many times as there are phone numbers to be memorized, and the ninth circuit is This method has the drawbacks of being complicated and time-consuming.

Therefore, in order to solve the above-mentioned drawbacks of the conventional technology, the present invention has been developed to initialize the memory using hardware when the power is turned on, thereby easily and with high reliability to prevent mistaken calls caused by incorrect operation of the dial function 0. The purpose is to prevent

[Means for solving problems]

In order to solve the above problem, the present invention uses all initialization signal input terminals in the RAM memory cell that stores the first digit to several digits of a telephone number, and uses a power-on reset signal when the power is turned on. Then, the end code was written to the RAM.

[Effect]

In the telephone dialer 0 having a built-in RAM configured as described above, when an address without a telephone number is accessed, an end code is read out.

As soon as the output of the end code detection gate is input to the control circuit, access to the RAM is stopped, and the output of the output generation circuit is also stopped. These six mistaken calls can be prevented.

〔Example〕

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

In FIG. 1, output 2 of address counter 1 of RAM,
3 are input to a Y address decoder 4 and a 1 address decoder 5, respectively.

The initialization signal input end pre-read RAM 5 is located at the first digit to the first digit of each telephone number storage address, and the rest are ordinary RAM.
7 constitutes the entire memory. The output 9 of the pulse generation circuit 8 is input to the initialization signal input end prediction RAM 5. This output 9 is further input to the control circuit 10 to initialize the control section. The output 11 of the memory is R
Output generation circuit 13 from EAD/WR engineering TK buffer 12
and is input to the end code detection gate 14. The output 15 of the detection gate 14 is input to the control circuit 10, and the outputs 16, 17, and 18 of the control circuit 10 are respectively input to the output generation circuit 13. RK AD/W R Engineering TFi Buffer 12. Input to address counter 1. As a result,
When an end code is detected in the output of the RAM, page output, reading from the RAM, and incrementing of the address counter are stopped. Input signals 19 are typically input from a keyboard interface circuit (not shown) provided on the same integrated circuit and entirely from an external keyboard (not shown).

In addition, Fig. 2(b) and to) are the first detailed circuit diagram of RAM5, and Fig. 2(b) and to) are the second detailed circuit diagram of RAM5, respectively.
, is an eighth detailed circuit diagram.

〔Effect of the invention〕

As explained above, the present invention has the effect of completely preventing wrong calls from the telephone dialer C by initializing the memory with a simple configuration.

[Brief explanation of drawings]

Fig. 1 shows the bronze L of the embodiment of this invention Fig. 2 (b);
Cb) and ω) are the first . FIG. 3 is a second and third detailed circuit diagram. 60. Initialization signal input terminal RAM 7, RAM 80. Pulse generation circuit 10, control circuit 131. Output generation circuit 140. End code detection gate and above Applicant Seiko Electronic Industries Co., Ltd. Agent Patent Attorney Mogami Professional for Gyrobody

Claims (4)

[Claims] (1) A rewritable memory device with a circuit that generates a pulse when the power is turned on and an initialization signal input terminal whose contents are initialized by the output of the pulse generation circuit from the first digit to the beginning of each telephone number storage address. a rewritable storage device having multiple digits; a detection gate that detects a data end code from an output of the rewritable storage device; and a control circuit that stops reading the storage device upon receiving the output of the detection gate. , an output signal generation circuit that is controlled by the control circuit and generates an output corresponding to data read from the storage device, and whose output generation is stopped by the control circuit that receives the output of the detection gate. Semiconductor integrated circuits for telephones. (2) Claim 1, characterized in that the storage device with an initialization signal input terminal is constituted by a two-input N@O@R gate and an inverter whose outputs are connected to each other's inputs. The semiconductor integrated circuit for telephone described above. (3) A telephone according to claim 1, wherein the storage device with an initialization signal input terminal is constituted by a two-input NAND gate and an inverter whose outputs are connected to each other's inputs. Semiconductor integrated circuit. (4) The storage device with an initialization signal input terminal includes a flip-flop consisting of a pair of inverters whose outputs are connected to each other's input, and an electrical connection between one output of the flip-flop and a certain potential. Claim 1 characterized in that it is composed of a connected switching element.
Semiconductor integrated circuit for telephones as described in .