JPS61150020A - Portable input and output device - Google Patents

Abstract

PURPOSE:To select a low electric current consumption (normal processing) mode and a high current consumption (high speed processing) mode by using the instruction of a microprocessor to change an operating clock. CONSTITUTION:The microprocessor 1 uses the instruction of clock change stored in a program storage section 2 so as to select a clock change circuit 6 through an address bus 5 and transmits a data relating to the instruction to the circuit 6 via a data bus 4. The circuit 6 produces a designated clock from a basic clock 7 and applies it to the microprocessor 1. In selecting the low current consumption (normal processing) mode, the normal clock is applied to the microprocessor 1 so as to use an input/output device for a long period regardless of its slow processing speed, and in selecting the high current consumption (high speed processing) mode, the high speed processing is executed regardless of the short operating time of the input/output device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a portable input/output device, and more particularly to a portable input/output device that fully uses a microprocessor.

[Conventional technology]

Conventionally, this type of portable input/output device uses a battery as its power source, and the microprocessor uses NMO8 (N-channel metal oxide semiconductor) to extend its operating time.
Instead, a CMOI (complementary metal oxide semi-integrated structure) is used, which has a characteristic that the current consumption is small and the current consumption changes almost in proportion to the operating frequency.

[Problems to be Solved by the Invention Jt, KaL, Since the operating frequency of a microprocessor is fixed in the circuit, if this operating frequency is fixed to a low frequency, the portable input/output device can operate. The time will be longer, but the processing speed of the microprocessor will be slower, −
However, fixing the frequency to a high one speeds up the processing speed of the microprocessor, but it has the disadvantage that the operating time of the portable input/output device becomes shorter.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a portable input/output device that can change the operating frequency of a microprocessor in accordance with operator operations.

[Elaborate means to solve problems]

According to the present invention, a portable input/output device can be obtained in which the operating frequency of a microprocessor can be changed by a program. That is, the portable input/output device of the present invention includes a microprocessor, a program storage section, a data storage section, a display section, a keyboard section, and a communication control section with a host device.
A portable input/output device having a built-in battery as a power source is characterized in that it is provided with a microprocessor clock changing circuit and changes the operating clock of the F microprocessor in accordance with instructions from the microprocessor.

〔Example〕

Next, the present invention will be described in detail with reference to all the drawings showing one embodiment of the present invention.

Referring to FIG. 1, a microprocessor 1 operates on a program stored in a program storage unit (ROM) 2 and stores the processing results in a data storage unit (RAM) 3. The microprocessor t1 operates with a clock from the clock change circuit 6. Microprocessor 1,
A clock change circuit 6 is selected by the address bus 5 according to a clock change instruction stored in the program storage section (W) 2, and data related to the instruction is sent to the clock change circuit 6 via the data bus 4. The modification circuit 6 generates a specified clock from the basic clock 7 and supplies it to the microprocessor 1. Based on the basic clock, the clock changing circuit 6 creates a clock with a frequency of 1/2 of the basic clock and a clock with a frequency of 1/2 of the basic clock, and selects the created clock in response to an instruction from the microprocessor 1.

In Diagram N2 showing the details of the clock change circuit 6 and FIG. It is supplied to the circuit 10 and the 1/2 frequency divider circuit 9. A clock @ which is 1/2 of the clock ■ is generated in the 172 frequency dividing circuit 9 and is supplied to the AND circuit 11. AND
Outputs U of circuits 10 and 11 are input to an OR circuit 12.

Now, flag 13 is Q=1. If Q=00 state, AN
The clock @ from the D circuit 11 is not output, and the clock ■ from the AND circuit 10 is output to the microprocessor 1 via the OR circuit 12.

If microprocessor 1 executes an instruction to change the clock, this instruction is transmitted to instruction decoder 14 via address bus 5 and data bus 4. The instruction decoder 14 sets the output ■ to the 0'' level. As a result, the flag 13 becomes the state of Q=0 and Q=1. Therefore, the AND circuit 10 is closed and the clock from the AND circuit 11 is @ is supplied to the microprocessor 1 via the JR circuit 12, and the clock cycle is changed.

In FIG. 4, which shows a block diagram of the entire portable input/output device, a microprocessor 1 receives a clock supply from a clock changing circuit 6 and uses a program stored in a program storage section (ROM) 2 to control a display control section. 19. Keyboard control unit 21. Communication control unit 23. and controls the printer control section 24. The data input from the keyboard 22 is stored in the data storage section (AM) 3, and the stored data is output to the host device via the communication control section 23 at a predetermined timing.

The microprocessor 1 has a program storage unit (ROM)
For example, after turning on the power to this device, a guidance display as shown in FIG. 5 is displayed on the display unit 20. Based on this guidance, the operator selects all operating clocks for the microprocessor 1 according to the degree of work. When set to the low current consumption (normal processing) mode, the clock @ is supplied to the microprocessor 1, and although the processing time is slow, the input/output device can be used for a long time.

If the high current consumption (high speed processing) mode is selected, the usable time of the input/output device will be shortened, but processing can be performed at high speed.

[Effects] As explained above, the present invention provides a portable input/output device with a clock changing circuit and allows the operating clock to be changed by instructions from a microprocessor, thereby allowing an operator to reduce current consumption (normally This makes it possible to select all modes of the processing mode, resulting in the effect that the operating state of the apparatus suitable for the processing operation can be obtained.

[Brief explanation of drawings]

Figure 7iZ1 is a block diagram showing one embodiment of the present invention, Figure 2 is a block diagram of a clock changing circuit, Figure 31 is a timing chart showing the operation timing of the clock changing circuit, and Figure 44 is a block diagram showing an embodiment of the present invention. Figure 5 is a block diagram of the binding showing the embodiment, and an unprinted diagram shows an example of the front cover of the outer leather part. 1... Microprocessor, 2... OM, 3... R, AMl 4... Data bus, 5... Address bus, 6...
Relock change circuit, 7...Basic clock, 8
, 9...1/2 frequency divider circuit, 10.11...
...AND circuit, 12...0)1 circuit, 13.
... Flag circuit, 14 ... Decoder circuit, 19 ... Keyboard control section, 20 ... Leather section, 21 ... Keyboard Control unit, 23...
. . . IMir11 control unit, 24 . . . Printer control unit, 26 . . . Battery. Figure 4 No. 5 (branch)

Claims (1)

[Claims] a program storage unit connected to the microprocessor via an address bus and a data bus and storing an operating program for the microprocessor; and a clock changing circuit that selects and supplies clocks of a plurality of cycles to the microprocessor; A portable input/output device, wherein the clock changing circuit changes an operating clock to the microprocessor according to a selection instruction stored in the program storage section.