A.5
803x/805x Feature Comparison
Table A-1. provides a feature-by-feature comparison of the 8051 core and several common
803x/805x configurations.
Table A-1. Feature Summary of 8051 Core and Common 803x/805x Configurations
Intel
Dallas
DS80C320
Anchor
8051
Feature
8031
8051
80C32
80C52
Clocks per instruction cycle
Program / Data Memory
12
-
12
12
-
12
4
-
4
4 KB
ROM
8 KB
ROM
8 K RAM
Internal RAM
Data Pointers
Serial Ports
128 bytes 128 bytes 256 bytes 256 bytes
256 bytes
256 bytes
1
1
2
5
1
1
2
5
1
1
3
6
1
1
3
6
2
2
2
2
16-bit Timers
3
3
Interrupt sources (total of int.
and ext.)
13
13
Stretch memory cycles
no
no
no
no
yes
yes
A - 4
Appendix A: 8051 Introduction
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