CN204143541U

CN204143541U - ATM service keyboard

Info

Publication number: CN204143541U
Application number: CN201420476098.3U
Authority: CN
Inventors: 吴连玉; 王应建
Original assignee: Shenzhen Yihua Computer Co Ltd; Shenzhen Yihua Time Technology Co Ltd; Shenzhen Yihua Financial Intelligent Research Institute
Current assignee: Shenzhen Yihua Computer Co Ltd; Shenzhen Yihua Time Technology Co Ltd; Shenzhen Yihua Financial Intelligent Research Institute
Priority date: 2014-08-22
Filing date: 2014-08-22
Publication date: 2015-02-04
Anticipated expiration: 2024-08-22

Abstract

A kind of ATM service keyboard, this keyboard scan integrated circuit comprises 4 × 7 matrix keyboards; Described 4 × 7 matrix keyboards comprise four column scan output pin DIG1 ~ DIG4 and 7 line scanning input pin KI1 ~ KI7 pins, and each line scanning input pin KI1 ~ KI7 is with inner pull down resistor; Described four column scan output pin DIG1 ~ DIG4 according to the order preset, export high level successively during keyboard scan, all the other column scan output pin output low levels; The output of described line scanning input pin KI1 ~ KI7 is prohibited, when not having key to be pressed, described line scanning input pin KI1 ~ KI7 by drop-down be low level, when there being key to be pressed, the column scan output pin that this key pressed is corresponding and line scanning input pin export high level.Utilize the utility model can reduce the cost of whole scheme.

Description

ATM service keyboard

Technical field

The utility model relates to ATM attended operation portion, particularly a kind of ATM service keyboard.

Background technology

At ATM in bank (Auto Trade Machine, self-help teller machine) in, generally there is an attended operation portion, this attended operation portion is for plant maintenance person, and plant maintenance person can complete the maintenance work such as software upgrading, localization of fault, cleaning, replacing parts, correction to equipment by this attended operation portion.ATM attended operation portion is normally made up of maintenance display screen and service keyboard.

ATM service keyboard of the prior art is generally with a MCU(Micro Control Unit, micro-control unit) be core, realize button by this MCU to detect, the button form of general service keyboard is a key-press matrix (24 buttons) of 4 x 6, be divided into 3 part compositions, a 4x4 key-press matrix and two 1x4 key-press matrixs, wherein 4x4 key-press matrix is for numeral input, and two 1x4 key-press matrixs are used for function input.4x6 key-press matrix is made up of 4 row, 6 row, and 4 that connect MCU respectively export IO pin and 6 input IO pins.The state of the software timing poll IO pin of MCU, detects the key-press status of service keyboard with this, and by software simulating button debounce processing.MCU is by RS-232(serial ports) key state information is uploaded to host computer.

This scheme weak point is the MCU software administration needing keypad, comprises the exploitation of MCU software, debugging, maintenance, upgrading etc., and cost is also relatively high simultaneously.

Utility model content

In view of above content, the utility model proposes a kind of new ATM service keyboard, adopt the MCU chip that a keyboard scan integrated circuit keyboard scan IC comes in alternative prior art.Keyboard scan IC interior integrated keypad scan function special circuit, is detected by hardware implementing button, is different from the method by MCU software simulating in prior art.

Described ATM service keyboard comprises a keyboard scan integrated circuit, and this keyboard scan integrated circuit inserts keyboard scan every Preset Time in display driver scanning process, and wherein, this keyboard scan integrated circuit comprises 4 x 7 matrix keyboards; Described 4 x 7 matrix keyboards comprise four column scan output pin DIG1 ~ DIG4 and 7 line scanning input pin KI1 ~ KI7 pins, and each line scanning input pin KI1 ~ KI7 is with inner pull down resistor; Described four column scan output pin DIG1 ~ DIG4 according to the order preset, export high level successively during keyboard scan, all the other column scan output pin output low levels; When not having key to be pressed, described line scanning input pin KI1 ~ KI7 by drop-down be low level, when there being key to be pressed, the column scan output pin that this key pressed is corresponding and line scanning input pin export high level.

Further, described column scan output pin DIG1 ~ DIG4 pin carries out column scan output by I/O r/w cell.

Further, described line scanning input pin KI1 ~ KI7 reads unit by I/O and carries out line scanning input.

Further, described keyboard scan integrated circuit is used for, when the coming to the same thing of twice keyboard scan, judging that button is as effective button.

Further, described keyboard scan integrated circuit also for when effective button being detected, then records key code, and produces the keyboard interrupt signal of Low level effective by multiplexing interrupt pin.

Further, described keyboard scan integrated circuit also on detecting once effectively before button, shield keyboard look-at-me.

Further, the key code of described record also for when producing keyboard interrupt signal, is transferred to host computer by described keyboard scan integrated circuit.

Further, the key code of described record, by internal integrate circuit bus interface, is transferred to host computer by described keyboard scan integrated circuit.

Further, described keyboard scan integrated circuit also for by internal integrate circuit bus interface, receives the configuration parameter of host computer transmission.

Further, described configuration parameter comprises keyboard scan interval time.

Compared to prior art, the MCU chip that the ATM service keyboard of the utility model design adopts a keyboard scan integrated circuit keyboard scan IC to come in alternative prior art.Keyboard scan IC interior integrated keypad scan function special circuit, detected by hardware implementing button, be different from the method by MCU software simulating in prior art, reduce the workload of keypad MCU software, comprise the exploitation of MCU software, debugging, maintenance, upgrading etc., reduce the cost of whole scheme simultaneously.

Accompanying drawing explanation

Fig. 1 is the structured flowchart of the ATM service keyboard in the utility model.

Embodiment

Consulting shown in Fig. 1, is the structured flowchart of the ATM service keyboard in the utility model.Compared to prior art, the MCU chip that the ATM service keyboard 20 in the utility model adopts a keyboard scan integrated circuit 201 to come in alternative prior art.In the present embodiment, keyboard scan integrated circuit 201 inner integrated keypad scan function special circuit, is detected by hardware implementing button.In the present embodiment, the keyboard scan function of keyboard scan integrated circuit 201 can support at most 4 x 7 matrix 28 key boards.During keyboard scan, DIG1 ~ DIG4 pin is used for column scan and exports, and such as, is exported by I/O r/w cell, and KI1 ~ KI7 pin, all with inner pull down resistor, for line scanning input, such as, reads unit input by I/O.

In the present embodiment, keyboard scan integrated circuit 201 inserts keyboard scan every Preset Time in display driver scanning process, such as, inserts a keyboard scan by timing unit every 30 seconds.During keyboard scan, DIG1 ~ DIG4 pin, according to the order preset (order as DIG 1 to DIG 4), exports high level successively, all the other pin output low levels.Such as, when DIG1 exports high level, DIG2 to DIG4 output low level.

In keyboard scan process, the output of KI1 ~ KI7 pin is prohibited, when not having key to be pressed, KI1 ~ KI7 all by drop-down be low level; When there being key to be pressed, such as connect DIG 4 and be pressed with the key of KI2, then when DIG4 exports high level, KI2 detects high level.Preferably, in order to prevent from producing error code because of key jitter or external interference, keyboard scan integrated circuit 201 carries out twice sweep, only has when the coming to the same thing of twice keyboard scan, just button can be identified effectively.If keyboard scan integrated circuit 201 detects effective button, then record key code, and the keyboard interrupt signal of Low level effective is produced by multiplexing interrupt pin (KP), now single-chip microcomputer (as keyboard scan integrated circuit 201) can read key code by serial line interface.When producing keyboard interrupt signal, keyboard scan integrated circuit 201 sends key-press status scanning result, as the key code of above-mentioned record to host computer.

Further, before new effective button not detected, keyboard scan integrated circuit 201 no longer produces any keyboard interrupt signal, namely shields any keyboard interrupt signal.

The communication interface of keyboard scan integrated circuit 201 and host computer is I2C(Inter-Integrated Circuit, internal integrate circuit bus) interface, the configuration parameter (as keyboard scan interval time etc.) of host computer can be received by I2C interface keyboard scan IC 201, also key-press status scanning result is sent, as the key code of above-mentioned record by I2C interface keyboard scan IC 201 to host computer.

It should be noted that, Fig. 1 is only the exemplary illustration to ATM service keyboard 20, and those skilled in the art can understand, and described ATM service keyboard 20 also comprises the element of other necessity, as buffer memory, power supply and communication unit etc., does not repeat them here.

Above content is the detailed description done the utility model in conjunction with concrete preferred implementation, can not assert that concrete enforcement is confined to these explanations.For person of an ordinary skill in the technical field, without departing from the concept of the premise utility, some simple deduction or replace can also be made, all should be considered as belonging to protection domain of the present utility model.

Claims

1. an ATM service keyboard, it is characterized in that, this ATM service keyboard comprises a keyboard scan integrated circuit, this keyboard scan integrated circuit inserts keyboard scan every Preset Time in display driver scanning process, wherein, this keyboard scan integrated circuit comprises 4 x 7 matrix keyboards;

Described 4 x 7 matrix keyboards comprise four column scan output pin DIG1 ~ DIG4 and 7 line scanning input pin KI1 ~ KI7 pins, and each line scanning input pin KI1 ~ KI7 is with inner pull down resistor;

Described four column scan output pin DIG1 ~ DIG4 according to the order preset, export high level successively during keyboard scan, all the other column scan output pin output low levels; And

When not having key to be pressed, described line scanning input pin KI1 ~ KI7 by drop-down be low level, when there being key to be pressed, the column scan output pin that this key pressed is corresponding and line scanning input pin export high level.

2. ATM service keyboard according to claim 1, is characterized in that, described column scan output pin DIG1 ~ DIG4 pin carries out column scan output by I/O r/w cell.

3. ATM service keyboard according to claim 1, is characterized in that, described line scanning input pin KI1 ~ KI7 reads unit by I/O and carries out line scanning input.

4. ATM service keyboard according to claim 1, is characterized in that, described keyboard scan integrated circuit is used for, when the coming to the same thing of twice keyboard scan, judging that button is as effective button.

5. ATM service keyboard according to claim 4, is characterized in that, described keyboard scan integrated circuit also for when effective button being detected, then records key code, and produces the keyboard interrupt signal of Low level effective by multiplexing interrupt pin.

6. ATM service keyboard according to claim 5, is characterized in that, described keyboard scan integrated circuit also on detecting once effectively before button, shield keyboard look-at-me.

7. according to the ATM service keyboard of claim 6 described in one of them, it is characterized in that, the key code of described record also for when producing keyboard interrupt signal, is transferred to host computer by described keyboard scan integrated circuit.

8. ATM service keyboard according to claim 7, is characterized in that, the key code of described record, by internal integrate circuit bus interface, is transferred to host computer by described keyboard scan integrated circuit.

9. ATM service keyboard according to claim 8, is characterized in that, described keyboard scan integrated circuit also for by internal integrate circuit bus interface, receives the configuration parameter of host computer transmission.

10. ATM service keyboard according to claim 9, is characterized in that, described configuration parameter comprises keyboard scan interval time.