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Details, datasheet, quote on part number:NT6881-D1012
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Datasheet text preview:
NT6881
USB Keyboard Micro-Controller
V2.8
1
NT6881
1 2 3 4 5 6 7 8 REVISION HISTORY .... 4 FEATURES ... 5 GENERAL DESCRIPTION .... 5 PIN CONFIGURATION .......... 5 PAD CONFIGURATION......... 6 BLOCK DIAGRAM ....... 7 PIN AND PAD DESCRIPTIONS ........... 8 FUNCTIONAL DESCRIPTION ............. 9 8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 8.9 6502CPU ............. 9 INSTRUCTION SET LIST .......... 10 MASK ROM ....... 12 SRAM .......... 12 SYSTEM RESERVED REGISTERS ... 13 POWER-ON RESET ... 13 TIMING GENERATOR......... 13 BASE TIMER (BT) ...... 14 INTERRUPT CONTROLLER ..... 15
8.9.1 TIMER INTERRUPT ... 15 8.9.2 INT0 INTERRUPT ...... 15 8.9.3 INT1 INTERRUPT ...... 15 8.9.4 KBD INTERRUPT ...... 15 8.9.5 IN0 TOKEN INTERRUPT .......... 15 8.9.6 OT0 (OUT0) TOKEN INTERRUPT ..... 15 8.9.7 IN1 TOKEN INTERRUPT .......... 16 8.9.8 IN2 TOKEN INTERRUPT .......... 16
2003/2/24 2 Ver2.8
NT6881
8.9.9 STUP (SETUP) TOKEN INTERRUPT ......... 16 8.9.10 SUSP INTERRUPT... 16 8.10 I/O PORTS ....... 16 8.11 WATCH-DOG TIMER (WDT).... 17 8.12 POWER CONTROL .. 17 8.13 UNIVERSAL SERIAL BUS INTERFACE.......... 17 8.14 SUSPEND AND RESUME........ 17 8.15 RESET SOURCE SUMMERY ........... 18 8.16 PS/2 MOUSE APPLICATION............ 18 9 ABSOLUTE MAXIMUM RATING........ 19
10 DC ELECTRICAL CHARACTERISTICS ...... 19 11 AC ELECTRICAL CHARACTERISTICS ...... 20 12 APPLICATION CIRCUIT 1 (SIMPLE KEYBOARD WITH PS/2 MOUSE) .... 21 13 APPLICATION CIRCUIT 2 (WINDOWS 2000 COMPATIBLE KEYBOARD) ........ 22 14 APPLICATION CIRCUIT 3 (MINI KEYBOARD).......... 23 11 BONDING DIAGRAM .......... 25 12 ORDERING INFORMATION ........ 26 13 PACKAGE INFORMATION ......... 27
2003/2/24
3
Ver2.8
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