JP2001285207A - Electronic clock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic clock that can considerably enhance the service life of its battery by reducing the current consumption at infrared ray communication. SOLUTION: The electronic clock is characterized by the configuration consisting of a baud rate generator that decides a data transfer rate, a timing controller that takes data transmission reception timing, a transmission data buffer that stores transmission data, a reception data buffer that stores received data, an infrared ray modulation circuit to drive an infrared ray, an infrared ray receiving element to receive the infrared ray, a reception inversion control circuit that controls inversion of received data, a transmission inversion control circuit that controls inversion of transmission data, and a central processing unit that interprets and processes an inversion bit to denote data inversion and the data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic timepiece, and more particularly, to a part that processes data such as time, calendar, personal information, and electronic files on a personal computer and communicates using infrared rays. The present invention relates to a configuration of an electronic timepiece.

[0002]

2. Description of the Related Art FIG. 2 is a schematic block diagram of an electronic timepiece according to the prior art.

As shown in FIG. 2, a conventional electronic timepiece 20 includes a baud rate generator 22, a timing controller 23, a transmission data buffer 24, a reception data buffer 26, an infrared modulation circuit 25, and an infrared light emitting element 40.
, An infrared light receiving element 41, and a central processing unit 21.

The operation will be described below with reference to FIG. In the case of transmission, when the central processing unit 21 writes data in the transmission data buffer 24, the timing controller 23 sets the timing of data transmission based on the clock 60 generated from the baud rate generator 22, and transmits the transmission data. The data in the buffer 24 is output as serial data 61 bit by bit. Infrared modulation circuit 2
5 generates a pulse signal 62 for driving the infrared light emitting element 40 from the serial data 61.

In the case of reception, the pulse signal 63 from the infrared light receiving element 41 is returned to the serial data 64 by the infrared modulation circuit 25, and the data is stored one bit at a time in the reception data buffer 26 at the timing designated by the timing controller 23. . The central processing unit 21 reads out the reception data buffer 26 and can recognize the reception data.

FIG. 4 is a current consumption graph of an electronic timepiece according to the prior art. When the data is 0, the pulse signal 62
Is output, and the infrared light emitting element 40 emits light. At this time,
As shown in FIG. 4, the current consumption increases in a pulsed manner. When the data is 1, no pulse is output and no current is consumed for light emission. That is, when the data is 0, a very large current is consumed.

[0007]

As described above, the electronic timepiece 20 of the prior art shown in FIG. 2 generates the pulse signal 62 every time the data to be transmitted is 0, and consumes a large current. Had the drawback of getting lost. As for the current consumption for infrared light emission, for example, in order to transmit data to a distance of about 1 m, a current of 40 to 50 mA has to flow.

[0008] An electronic timepiece usually has five operations in a time-only operation.
Only the current of about μA is consumed. On the other hand, the current consumption at the time of emitting infrared light is very large, which causes the battery life to be shortened.

An object of the present invention is to provide an electronic timepiece that solves the above-mentioned problems and reduces current consumption during infrared communication and greatly improves battery life.

[0010]

In order to achieve the above object, the electronic timepiece according to the present invention employs the following configuration.

An electronic timepiece having an infrared data communication function with an external electronic device, comprising: a baud rate generator for determining a data transfer rate; a timing controller for determining data transmission / reception timing; and transmission data for storing transmission data. A buffer, a reception data buffer for storing reception data, an infrared modulation circuit for driving infrared light, an infrared light emission element for emitting infrared light, an infrared light reception element for receiving infrared light, and reception data. Reception inversion control circuit for controlling inversion of data, transmission inversion control circuit for controlling inversion of transmission data, inversion bit for indicating data inversion, and a central processing unit for interpreting and processing data An electronic timepiece comprising:

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an electronic timepiece according to an embodiment of the present invention;

The configuration will be described below with reference to FIG. The operation of the electronic timepiece according to the present invention will be described with reference to FIGS.

The infrared communication function of the electronic timepiece 10 includes a baud rate generator 12 and a timing controller 13.
, A transmission data buffer 14, an inversion bit 15, a transmission inversion control circuit 16, a reception inversion control circuit 17, a reception data buffer 18, an infrared modulation circuit 19, an infrared light emitting element 30, an infrared light receiving element 31, , A central processing unit 11. Hereinafter, each function will be described.

The baud rate generator 12 has a function of determining a data transfer rate. The timing controller 13 has a function of setting data transmission / reception timing. Further, the transmission data buffer 14 has a function of storing transmission data.

The inversion bit 15 has a function of indicating data inversion.

The transmission inversion control circuit 16 has a function of controlling the inversion of transmission data.

The reception inversion control circuit 17 has a function of controlling the inversion of the received data.

The reception data buffer 18 has a function of storing reception data.

The infrared modulation circuit 19 has a function of driving infrared light.

The infrared light emitting element 30 has a function of emitting infrared light.

The infrared light receiving element 31 has a function of receiving infrared light.

Further, the central processing unit 11 is for interpreting and processing data.

Next, the operation of the infrared communication function at the time of transmission will be described with reference to FIG. When the central processing unit 11 writes the data into the transmission data buffer 14, the transmission inversion control circuit 16 checks the bit data in the transmission data buffer 14 and counts the number of bits having a value of 0. The count number is の of the total bit number of the transmission data buffer 14
If more, the transmission inversion control circuit 16 inverts all the bits in the transmission data buffer 14 and writes 0 in the inversion bit 15 to indicate the inversion.

The count number is smaller than 1/2 of the total bit number of the transmission data buffer 14, or just 1 /
If it is 2, the data in the transmission data buffer 14 is not inverted, and the inverted bit 1
Write 1 to 5.

The timing controller 13 takes the data transmission timing based on the clock 70 generated from the baud rate generator 12, first outputs the inverted bit 15 as serial data 71, and then outputs the data in the transmission data buffer 14. Is output as serial data 71 bit by bit. The infrared modulation circuit 19 generates a pulse signal 72 for driving the infrared light emitting element 30 from the serial data 71.

Next, the operation of the infrared communication function at the time of reception will be described with reference to FIG. The pulse signal 73 from the infrared light receiving element 31 is converted into the serial data 7 by the infrared modulation circuit 19.
4, and at the timing specified by the timing controller 13, the reception inversion control circuit 17 checks the leading data. When the first data is 0, that is, when it means inversion, the subsequent data is stored in the reception data buffer 18 bit by bit while being inverted.

If the first data is 1, that is, if it means non-inversion, the subsequent data is stored in the reception data buffer 18 bit by bit as it is. The central processing unit 11 can read the reception data buffer 18 and recognize the reception data.

The state transition of the current consumption during transmission will be described with reference to FIG. When the serial data 71 is 0, a pulse signal 72 is generated, and in synchronization with the pulse signal 72, the current consumption increases in a pulsed manner. However, due to the operation of the transmission inversion control circuit 16, the serial data 71
Is reduced to zero, so that the number of times the current is consumed in a pulsed manner is reduced. Compared to the prior art shown in FIG. 4, the pulsed current consumption is halved despite the transmission of the same data.

[0030]

As is apparent from the above, according to the structure of the present invention, it is possible to provide an electronic timepiece having a significantly improved battery life.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram showing an electronic timepiece of the present invention.

FIG. 2 is a schematic block diagram of an electronic timepiece according to the related art.

FIG. 3 is a current consumption graph of the electronic timepiece of the present invention.

FIG. 4 is a current consumption graph of an electronic timepiece according to the related art.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 electronic timepiece 11 central processing unit 12 baud rate generator 13 timing controller 14 transmission data buffer 15 inversion bit 16 transmission inversion control circuit 17 reception inversion control circuit 18 reception data buffer 19 infrared modulation circuit 30 infrared light emitting element 31 infrared light receiving element 70 clock 71 Serial data 72 Pulse signal 73 Pulse signal 74 Serial data

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G04G 1/00 317 H04B 10/105 10/10 10/22

Claims (1)

[Claims] 1. An electronic timepiece having an infrared data communication function with an external electronic device, comprising: a baud rate generator for determining a data transfer rate; a timing controller for taking data transmission / reception timing; and a storage device for storing transmission data. A transmission data buffer, a reception data buffer for storing reception data, an infrared modulation circuit for driving infrared light, an infrared light emitting element for emitting infrared light, and an infrared light receiving element for receiving infrared light, A reception inversion control circuit for controlling inversion of reception data, a transmission inversion control circuit for controlling inversion of transmission data, an inversion bit for indicating inversion of data, and a central operation for interpreting and processing data. An electronic timepiece comprising a processing device.