NT6868A Datasheet, PDF (3/14 Pages) List of Unclassifed Manufacturers – Keyboard Controller

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