NT6868A View Datasheet(PDF) - Novatek Microelectronics

Part Name

Description

Manufacturer

NT6868A

Keyboard Controller

Novatek Microelectronics 

Functional Description

6502 CPU

6502 is an 8-bit CPU. Refer to 6502 data sheet for details.

NT6868A

7

0

ACCUMULATOR A

7

0

INDEX REGISTER X

7

0

INDEX REGISTER Y

0000

007F

00C0

00CF

SRAM

UNUSED

SYSTEM REGISTERS

STACK PTR

15

0

PROGRAM COUNTER PC

UNUSED

7

0

F000

S

STACK POINTER SP

7

SV

0

B D I Z C STATUS REGISTER P

CARRY

ZERO

INTERRUPT MASK

DECIMAL MODE

BREAK

OVERFOLW

SIGN

FFFA

FFFB

FFFC

FFFD

FFFE

FFFF

USER ROM

NMI-L

NMI-H

RST-L

RST-H

IRQ-L

IRQ-H

NMI VECTOR

IRQ VECTOR

Figure 1. 6502 CPU Registers and Status Flags

Figure 2. NT6868A Memory Map

3

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