80C51 Microcontroller

Separate address spaces for program and data memory

• Program Memory: Up to 64k bytes, lower 4k on-chip
• Data Memory: Up to 64k bytes, MOVX instruction for external access
• On-chip RAM: 128 bytes
• Special Function Registers (SFRs)

Top Features:

• Separate address spaces for program and data memory
• 64k bytes of program memory
• 128 bytes of on-chip RAM
• MOVX instruction for external data memory access

Figure 1 shows a map of the 80C51 program memory. The lower 128 bytes of RAM can be accessed either by direct addressing (MOV data addr) or by indirect addressing (MOV @Ri).

*Images are for illustration only; actual product may vary.