W81281 View Datasheet(PDF) - Winbond

Part Name

Description

Manufacturer

W81281

USB Keyboard / Device Controller

Winbond 

W81281

Preliminary

TABLE OF CONTENT

1. GENERAL DESCRIPTION ................................................................................................................1

2. FEATURES .........................................................................................................................................2

3 BLOCK DIAGRAM .............................................................................................................................3

4. PIN CONFIGURATION ......................................................................................................................4

5. PIN DESCRIPTION ............................................................................................................................6

5.1 40 PIN DIP...........................................................................................................................................6

5.2 28-PIN SOP .........................................................................................................................................8

5.3 48-PIN LQFP......................................................................................................................................9

6 FUNCTIONAL DESCRIPTION ...............................................................................................................11

6.1 FIRST IN FIRST OUT STORAGE (FIFO'S) ORGANIZATION ....................................................................11

6.1.1 INTERFACE TO THE MICROCONTROLLER:.......................................................................11

6.2 REGISTER DESCRITPION ......................................................................................................................12

6.2.1 Status Registers ........................................................................................................................12

6.2.2 Control Registers .......................................................................................................................13

6.3 RESET .................................................................................................................................................15

6.3.1 External Reset (Hardware Reset) ............................................................................................16

6.3.2 Warm Reset (Software Reset) .................................................................................................16

6.4 USB SUSPEND.................................................................................................................................16

6.5 USB RESUME:..................................................................................................................................16

7. PROGRAMMING NOTES: ..............................................................................................................17

7.1 CONTROL REGISTERS ACCESS:...........................................................................................................17

7.2 STATUS REGISTERS ACCESS:..............................................................................................................17

7.3 FIFOS ACCESS : .................................................................................................................................17

7.4 SET STALL FOR ENDPOINT 0 - 4 : ........................................................................................................17

7.5 SET NULL DATA FOR IN TRANSACTION OF EP 0 :................................................................................18

8. ELECTRICAL CHARACTERISTICS & CAPACITANCE..............................................................19

9. USB KEYBOARD SAMPLE APPLICATION .................................................................................22

10. PACKAGE DIMENSIONS................................................................................................................24

APPENDIX A: WINBOND( W81281-004) DEFAULT MATRIX CODE .................................................28

II

Publication Release Date: July 1999

Revision 0.60

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