JP2891901B2 - Wireless selective call receiver with display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio selective call receiver (hereinafter referred to as a pager), and more particularly to a temporary storage means (hereinafter referred to as a RAM) for storing message data and the like, and a program for controlling the pager. And a read-only storage unit (hereinafter referred to as a ROM) for storing multi-functions.

[0002]

2. Description of the Related Art In recent years, the degree of integration of integrated circuits (hereinafter, referred to as ICs) has increased, and decoders, CPUs, ROMs, and RAMs necessary for controlling a pager have been integrated into one IC. Applicatio
n Specific IC (ASIC)
Chips are becoming popular. But the size of the IC,
Due to the limitations of input / output terminals, not all pagers are integrated into one chip. Further, the pager has specifications such as a pager having a small function, a pager having a medium-sized function and a large-scale function, etc., depending on the function scale and the request from the customer. Although these functional scale differences exist, the same ASIC is often used for the control part of all these pagers in order to simplify manufacturing.

[0003] In the case of a pager having a relatively small function, it can be realized by an IC1 chip as described above.
A pager is configured using ROM and RAM in C. Since each area of ROM and RAM is provided in the limited IC space, for example, a ROM capacity of 320 kilobits and a RAM capacity of 16 kilobits cannot be so large. Therefore, since the program area is small and the message memory capacity is relatively small, the function is small.

On the other hand, in the case of a pager having a large function, A
ROM and RAM of the above-mentioned scale stored in SIC
Then it is unsatisfactory externally, for example, R of 2 megabit capacity
An OM, a RAM having a capacity of 64 kilobits is provided, and a program area and a message memory capacity can be made very large.

In the case of a pager having a medium function, A
SIC alone is unsatisfactory, and either ROM or RAM is further required. Which one to use depends on the functional requirements of the customer. So for this medium pager,
A mounting area for ROM and RAM and a mounting pattern are separately provided on a printed wiring board on which components are mounted. The reason why the mounting patterns are separately provided is that the size of the components differs depending on the memory capacity and that the terminal arrangement is slightly different between the ROM and the RAM.

[0006]

In the case of this conventional medium-sized pager, the size of components differs depending on the memory capacity, and the terminal arrangement is slightly different between ROM and RAM.
A mounting area for ROM and RAM and a mounting pattern are separately provided on a printed wiring board on which components are mounted. Therefore, when an additional ROM is used for a customer's function request, the mounting area of the RAM on the printed wiring board is wasted, while
In the case of adding a RAM, the mounting area of the ROM is wasted, and the mounting efficiency becomes very poor. As a result, there is a problem that the size of the printed wiring board increases and the size of the device increases. In addition, there is also a manufacturing problem in mounting the components, because the mounting positions of the ROM and the RAM are different, the mounting program must be changed one by one.

An object of the present invention is to provide a medium-sized pager with the same mounting area and mounting pattern provided on a printed wiring board so that either a ROM or a RAM to be added can be selectively used. Another object of the present invention is to provide a radio selective call receiver with a display that does not needlessly increase the device size in response to a function request for each customer.

Another object of the present invention is to arrange the pads so that the center positions of mounting the ROM and RAM on the printed wiring board coincide with each other.
It is an object of the present invention to provide a radio selective call receiver with a display which allows mounting of components with high flexibility in manufacturing.

[0009]

A radio selective call receiver with a display according to the present invention receives a radio signal containing message data and demodulates the radio signal, and decodes the signal demodulated by the radio unit. A decoder that outputs the message data when it is identified that the call is addressed to the own station, a ROM that stores a program for controlling the radio selective call receiver in advance, and a message data output from the decoder. A CPU that controls writing and reading by the program;
RAM for storing or outputting under control of PU
And a control unit configured as a one-chip IC, and a radio selective call receiver with a display, which is externally attached to the IC,
In order to extend the storage area of the received message,
Select one of the first storage means provided separately from the AM and the second storage means provided separately from the ROM in the same mounting area in order to expand the storage area of the program for adding the function of the radio selective calling receiver. The printed wiring board includes a wiring pattern that shares a mounting area of the first and second storage units.

[0010] Further, the printed wiring board is provided with the first or second storage means, so that the first and second storage means are arranged so that the center positions of these storage means coincide with each other. It has a pad.

[0011]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing one embodiment of the present invention.
(A) is a diagram showing a pager using a RAM externally attached to the ASIC, and (b) is a diagram showing an RO externally attached to the ASIC.
FIG. 3 is a diagram illustrating a pager using M.

In FIG. 1A, a pager includes an antenna 1 for receiving a radio signal, a radio unit 2 for demodulating a radio signal including message data received by the antenna 1,
A decoder 3 that decodes the signal demodulated by the radio unit 2 and outputs the message data received when the call is addressed to the own station, and a ROM 4 that stores a program for controlling the pager in advance. And C for controlling the writing and reading of the message data output from the decoder 3 by a program stored in the ROM 4.
PU 5, RAM 6 for storing or outputting message data under the control of CPU 5, ID-ROM 8 previously storing a selective call number of its own station and system information unique to a pager, An LCD 10 for displaying the message data when the message data is included, and an LCD driver 9 for driving the LCD 10 under the control of the CPU 5 are provided. The control unit 7 includes the decoder 3, the ROM 4, the CPU 5, and the RAM 6 on a single chip, and forms a so-called ASIC.
It is called. The received message data is stored in the RAM 6 in the control unit 7 or an external RAM 11 having a capacity of, for example, 64 kilobits. In FIG. 1, the notifying section for comparing the selective calling signal of the own station with the selective calling signal included in the received data and notifying the owner of the pager by sound or vibration when they match is omitted. . FIG. 1 (b) is different from FIG.
In place of 1, for example, the ROM 12 for storing an additional program is the same except for a ROM 12 having a capacity of 2 megabits.
Description is omitted.

Here, the manufacturer decides whether to use one of the RAM 11 and the ROM 12 based on the customer's specifications, and selects the RAM 11 when emphasizing the message memory capacity. When importance is attached to the ROM, the ROM 12 is selected. For this reason, the following contrivance has been made on the printed wiring board of the pager.

FIG. 2 is a diagram showing an example of a wiring example of a mounting pattern of a printed wiring board common to ROM and RAM.
FIG. 3 is a diagram showing an example of an actual printed wiring board pattern in FIG. 2. In FIG. 2, the smaller IC is RA
M, for example, SRM2564TM, with a capacity of 64 kilobits and a TSOP 28 pin (pin pitch 0.55 mm) type. The larger IC is a ROM and has a capacity of 1 megabit and a TSOP 32-pin type (pin pitch: 0.5 mm). As shown in FIG. 2, the address buses (A0, A1, A2,...) Of the ROM and RAM and the data bus (O
0, O1, O2,...), Power supply lines, and ground lines have very similar pin arrangements, and wirings 4a and 4b as shown in FIG. 2 are possible. As for the control line, the line related to the read can be commonly used, and the control line related to the write of the RAM is an independent line only for the RAM. These are wired between the ROM pad 2a and the RAM pad 3b (partially between the RAM pads 3).
The wiring is provided between the OM pad 2b and the RAM pad 3a.

FIG. 3 is a pattern diagram specifically showing the wiring of FIG. 2 in a mounting pattern of a printed wiring board.
RO in case of RAM 64Kbit 28pin package
Since the package size is smaller than that of the M1 megabit 32-pin package, it can be sufficiently contained in the ROM mounting pad. Therefore, the address bus, data bus, write control line, power supply line, and ground line, which can be commonly used for wiring, are connected to the ROM pads 2a and 2b and the RAM pads 3a and 3 respectively.
b. Then, a common ROM and RAM pattern is formed. After that, connecting the pattern coming out of the ROM (larger one) to the ASIC is completed.

By providing the wiring pattern sharing the mounting area of the ROM and RAM on the printed circuit board of the pager, the mounting area can be used effectively, the mounting efficiency can be improved, and the size of the pager can be reduced. . Further, it is possible to easily change the function of the pager. Further, if the component center positions of the ROM and the RAM are set to be the same, it is possible to use a common mounting program for component mounting. That is, components can be mounted without changing the mounting program.

[0017]

As described above, the decoder, RO,
A radio selective call receiver with a display according to the present invention including a control unit in which the M, RAM, and CPU are formed by a one-chip IC is provided externally to a one-chip IC, and is provided within a single chip for expanding a storage area of a received message. In order to extend the storage area for the first storage means and the pager addition program, which is different from the RAM, any one of the second storage means different from the ROM in one chip is selectively mounted in the same mounting area. By providing a possible printed wiring board, the mounting efficiency of the pager on the printed wiring board is significantly improved, and the size of the pager can be reduced. Further, this printed wiring board is provided with pads for storage means arranged so that the center positions of the first and second storage means coincide with each other, so that the component mounting program is not changed. These storage means can be mounted.

Therefore, the pager can cope with a function request for each customer without needlessly increasing the device size, and can cope with the manufacturing process without any change other than the change of the storage means.

[Brief description of the drawings]

FIG. 1A is a configuration diagram showing a pager using a RAM externally attached to an ASIC according to an embodiment of the present invention.
(B) shows an externally connected R in the ASIC according to one embodiment of the present invention.
FIG. 2 is a configuration diagram illustrating a pager using an OM.

FIG. 2 is a diagram showing an example of a wiring array of a mounting pattern of a printed wiring board common to ROM and RAM.

FIG. 3 is a diagram showing an example of an actual printed wiring board pattern in FIG. 2;

[Explanation of symbols]

 Reference Signs List 1 antenna 2 radio unit 3 decoder 4, 12 ROM 5 CPU 6, 11 RAM 7 control unit 8 ID-ROM 9 LCD driver 10 LCD 2a, 2b ROM pad 3a, 3b RAM pad 4a to 4d Wiring

Claims (1)

(57) [Claims] A wireless signal including message data is received.
A radio unit for transmitting and demodulating the signal, and decoding the signal demodulated by the radio unit and
When the message data is identified as
Control the decoder that outputs the data and the radio selective calling receiver.
ROM that stores the program to be used in advance
And the message data output from the decoder
A CPU that controls writing and reading by the program, and stores the message data based on the control of the CPU.
Alternatively, a RAM for output is composed of a one-chip IC.
Wireless selective call receiver with display, comprising
There it is external to the IC, storage area of the message received
A first memory provided separately from the RAM to extend
Program for adding function of storage means and radio selective call receiver
It is set up separately from the ROM to extend the storage area of the RAM.
One of the second storage means to be installed in the same mounting area
Selectively includes a mountable printed wiring board, the printed wiring board, a wiring pattern sharing mounting area of the first and second storage means, the first addition
Are arranged so that the center positions of the second storage means match.
Pads for the first and second storage means,
Wiring for connecting pads for the first and second storage means
And a radio selective call receiver with a display.