W79E548 Datasheet, PDF (30/79 Pages) Winbond – 8-BIT MICROCONTROLLER

W79E548/W79L548
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
Instruction Fetch
Operand Fetch
Operand Fetch
C1 C2 C3 C4 C1
C2 C3 C4 C1
C2 C3 C4
CLK
ALE
PSEN
AD7-0
PORT 2
A7-0 OP-CODE
Address A15-8
A7-0 OPERAND
Address A15-8
A7-0 OPERAND
Address A15-8
Figure 5. Three Cycle Instruction Timing
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