avr6502

6502 emulator on ATmega328P

TODO

1. LED Matrix Support

2. I2C Support

Note

Program should start at 0x8000, and its size shouldn't exceed 0x2000 bytes.

Current Memory Mapping

Segment	Start Address	Size
TEXT	0x8000	0x2000
HOST FUNCTIONS	0x5000	0x3000
KEY	0x4000	0x1000
LED	0x2000	0x2000
BLANK1	0x800	0x1800
RAM	0x200	0x600
STACK	0x100	0x100
RESERVED	0x0	0x100

LED Segment

each LED has 8 bytes: STATUS R G B HL HI V

Note: Each hue has two bytes with lower 8 bits first.

Host Functions Segment

This segment contains useful functions for subsystem to use

Delay Register

0x5000 DELAY_DATA_CTRL 0x5001 DELAY_DATA_LSB 0x5002 DELAY_DATA_MSB

Set DELAY_DATA_CTRL to 1 to pause subsystem After the pause, host will set DELAY_DATA_CTRL to 0

Resources

6502 cpu implementation: fake6502

Online assembler: ASM80