NT68P81 查看數據表（PDF） - Novatek Microelectronics

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NT68P81

USB Keyboard Micro-Controller

Novatek Microelectronics 

NT68P81

4. SRAM: 256 X 8 bits

The built-in SRAM is used for general purpose data memory and for stack area. SRAM is addressed from 0080H to

017FH. Because the 6502C default stack pointer is 01FFH, the stack area will map $01FF-$0180 to $00FF-$0080, thus

the programmer can set the “S” register to 7FH when starting program, allowing stack point to be 017FH.

as; LDX

TXS

#$7F

$0000

$001F

$0080

$00FF

$0100

$017F

System Registers

Unused

RAM

RAM

Unused

stack pointer

$E800

$FFFA

$FFFB

$FFFC

$FFFD

$FFFE

$FFFF

ROM

NMI-L

NMI-H

RST-L

RST-H

IRQ-L

IRQ-H

NMI Vector

RESET Vector

IRQ Vector

13

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