EZ-USB Datasheet, PDF (283/334 Pages) Cypress Semiconductor – The EZ-USB USB Integrated Circuit

B.1.2 Instruction Set
All 8051 instructions are binary code compatible and perform the same functions as they do
with the industry standard 8051. The effects of these instructions on bits, flags, and other
status functions is identical to the industry standard 8051. However, the timing of the
instructions is different, both in terms of number of clock cycles per instruction cycle and
timing within the instruction cycle.
Figure B-2 lists the 8051 instruction set and the number of instruction cycles required to
complete each instruction. Table B-1. defines the symbols and mnemonics used in Table B-2.
Lower 128 bytes
7Fh
Direct RAM
30h
Bank
2Fh _7F . . .
78
Select
(PSW bits
4,3)
.
B. it-Addressable
R. egisters
20h ^{07 . . .}
00
1Fh
11
18h
Bank 3
17h
10
10h
Bank 2
01
0Fh
08h
Bank 1
07h
00
00h
Bank 0
Indirect addressing only
FFh
Upper 128
bytes
(optional)
80h
7Fh
Lower 128
bytes
FFh
SFR space
80h
Direct addressing only
00h
Direct or indirect addressing
Figure B-2 Internal RAM Organization
EZ-USB v1.9
Appendix B: 8051 Architectural Overview
B-3