W77C32/W77C032A
Operand Fetch
Instruction Fetch
C2 C3
C1
C4
C1
C2
C3
C4
CLK
ALE
PSEN
AD7-0
PC
OP-CODE
PC+1
OPERAND
Address A15-8
Address A15-8
PORT 2
Figure 4: Two Cycle Instruction Timing
Operand Fetch
Instruction Fetch
Operand Fetch
C1
C2
C3
C4
C1
C2
C3
C4
C1
C2
C3
C4
CLK
ALE
PSEN
AD7-0
A7-0
OP-CODE
A7-0
OPERAND
A7-0
OPERAND
Address A15-8
Address A15-8
Address A15-8
PORT 2
Figure 5: Three Cycle Instruction Timing
Instruction Fetch
Operand Fetch
Operand Fetch
Operand Fetch
C1
C2 C3 C4 C1 C2 C3 C4 C1 C2 C3 C4 C1 C2 C3 C4
CLK
ALE
PSEN
AD7-0
OP-CODE
A7-0
A7-0
A7-0
OPERAND
OPERAND
OPERAND
A7-0
Port 2
Address A15-8
Address A15-8
Address A15-8
Address A15-8
Figure 6: Four Cycle Instruction Timing
Publication Release Date: February 1, 2007
Revision A8
- 35 -
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