NT68P61A Datasheet, PDF (5/48 Pages) List of Unclassifed Manufacturers – 8-Bit Microcontroller for Monitor (24K OTP ROM Type)

NT68P61A
Functional Descriptions
1. 6502 CPU
The 6502 is an 8-bit CPU that provides 56 instructions, decimal and binary arithmetic, thirteen addressing modes, true
indexing capability, programmable stack pointer with variable length stack, a wide selection of addressable memory, and
interrupt input options.
The CPU clock cycle is 4MHz (8MHz system clock divided by 2). Refer to 6502 data sheet for more details.
7
0
Accumulator A
7
0
Index Register Y
7
0
Index Register X
15
8
Program Counter PCH
PCL
7
0
7
0
Stack Pointer SP
7
NV
0
B D I Z C Status Register P
Carry
Zero
IRQ Disable
Decimal Mode
BRK Command
Overflow
Negative
1 = TRUE
1 = Result ZERO
1 = DISABLE
1 = TRUE
1 = BRK
1 = TRUE
1 = NEG
Figure 1. 6502 CPU Registers and Status Flags
5