EM83053A datasheet, PDF - EEWORLD Datasheet

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EM83053A: Descriptionkeyboard encoder; File Size208KB，24 Pages; ManufacturerEMC [ELAN Microelectronics Corp]

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keyboard encoder

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EM83053A/BH

KEYBOARD ENCODER

GENERAL DESCRIPTION

The EM83053A/BH microcontroller is dedicated to a keyboard encoder ,specially designed for IBM PC AT and

all compatible machines. The EM83053A/BH controll all scan codes, three LEDs status, scan timing and

communications between the keyboard and PC. It is easy to implement a high performance, low cost keyboard

with the minimal external components.

FEATURES

•

Low cost - eliminate need external components.

Phantom key detects.

RC oscillator ( 1.8432MHz ).

Support scan code set 1 ,2 and 3.

Support PC AT and PS/2 keyboard .

Low power CMOS device technology.

Internal pull-up resistor.

Tri-state outputs for easy board application.

Built-in 4K ROM.

Support WINDOWS

95, 98, 2000 keys.

104/107 keys with multi-media or other special application keyboard encoder.

WINDOWS is registered trademarks of Microsoft corperation.

APPLICATION

•

IBM PC AT or compatible machine keyboard.

IBM PS/2 model 30,50,60,80 or compatible machine keyboard.

Japanese keyboard.

Korean keyboard.

Brazilian keyboard.

European keyboard.

PIN ASSIGNMENTS

R_OSCI

VDD

CAPS

P90

CLK

DATA

OSCO

GND

P90

CLK

DATA

OSCO

GND

R_OSCI

VDD

CAPS

P91

P92

P93

P95

P50

P51

P52

P53

P54

EM83053AH

NUM

SCROLL

P67

P66

P65

P64

P63

P62

P61

P60

P91

P92

P93

P94

P95

P50

P51

P52

P53

P54

EM83053BH

NUM

SCROLL

P67

P66

P65

P64

P63

P62

P61

P60

P55

P56

P57

P80

P81

P82

P83

P84

P85

P86

P87

* This specification are subject to be changed without notice.

P55

P56

P57

P80

P81

P82

P83

P84

P85

P86

P87

6.9.2000

EM83053A/BH

KEYBOARD ENCODER

FUNCTION DESCRIPTIONS

Keyboard buffer

The keyboard will buffer 16 bytes in a first-in-first-out order when the system is able to receive scan codes

from the keyboard. The response codes and repeated codes will not be buffered. If keystrokes generate a

multiple-byte sequence, the entire sequence must fit into the buffer or the keystroke is discarded and a buffer-

overrun condition occurs.

Power-on Reset and self test

The duration of the keyboard Power-on-Reset(POR) should be within 150 milliseconds and 2 seconds after

the power is applied to the keyboard.

After executing POR , the keyboard executes a self test. The LEDs are turned on at the beginning and off at

the end of the self test. The self test takes a minimum 300 milliseconds and a maximum 500 milliseconds.

If the self test is successful, a completion code AA hex is sent to the system and the keyboard starts scanning.

If the self test fails, and error code is sent, the keyboard is disabled and waits for a command from the system.

The completion codes are sent between 450 milliseconds and 2.5 seconds after POR, and between 300 and

500 milliseconds after a RESET command is acknowledged.

Keyboard data output

When the keyboard is ready to send data to the system, it first checks clock and data lines. If either one is in

the low state, data is stored in the keyboard buffer. If both are in the high state, keyboard starts clocking data

out. Data will be valid before the trailing edge and after the leading edge of the clock pulse. During the

transmission the keyboard checks the clock line at least every 60 microseconds . If the system lowers the clock

lines before the leading edge of the 10th clock, the keyboard should stop sending, then buffer the data and

return clock and data lines to high state.

Keyboard data input

When the system is ready to send data to the keyboard, it first checks clock line to see if keyboard is sending

data. If keyboard is not sending data or it is sending data but has not reached the 10th clock, the system can

inhibit the interface by forcing the clock line low for more than 60 microseconds and prepares to send data.

The keyboard checks clock line status at least every 5 milliseconds. If a system Request to Send(RTS) is

detected, the keyboard clocks 11 bits in. After the 10th bit, the keyboard checks for a high state in data line

then pulls it low and clocks one more bit to signal the system that data has been received. If data is low after

the 10th bit, it indicates a frame error. The keyboard should continue to count until data line goes high, then

pulls it low and issues a RESEND to the system.

Command from the system

The system can send commands to the keyboard at any time. The keyboard needs to respond within 20

milliseconds, unless the system prevents keyboard output, when doing self test or executing a RESET.

The following are the keyboard input commands and the actions that keyboard needs to take.

Set /Reset Status indicators ( Hex ED )

- Responds ACK.

- Receives option byte.

* This specification are subject to be changed without notice.

6.9.2000

EM83053A Related Products

	EM83053A	EM83053AH	EM83053	EM83053BH
Description	keyboard encoder	keyboard encoder	keyboard encoder	keyboard encoder

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