W79E648 Datasheet, PDF (29/80 Pages) Winbond – Fast 8051 Compatible microcontroller with a redesigned Processor

Preliminary W79E648
the standard 8032. Therefore, even though the number of categories has increased, each instruction
is at least 1.5 to 3 times faster than the standard 8032 in terms of clock periods.
CLK
ALE
PSEN
AD7-0
PORT 2
Single Cycle
C1
C2
C3
C4
A7-0
Data_ in D7-0
Address A15-8
Figure 3. Single Cycle Instruction Timing
CLK
ALE
PSEN
AD7-0
PORT 2
Instruction Fetch
C1
C2
C3
C4
Operand Fetch
C1
C2
C3
C4
PC
OP-CODE
Address A15-8
PC+1
OPERAND
Address A15-8
Figure 4. Two Cycle Instruction Timing
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Publication Release Date: 05/31/2004
Revision A1