W79E825A Datasheet, PDF (58/127 Pages) Winbond – 8-BIT MICROCONTROLLER

W79E825A/824A/823B/822B Data Sheet
CPU CLK
Instruction Fetch
Operand Fetch
Operand Fetch
Operand Fetch
C1 C2 C3 C4 C1 C2 C3 C4 C1 C2 C3 C4 C1 C2 C3 C4
ALE
PSEN
AD<7:0>
A7-0 OP-CODE
A7-0 OPERAND
A7-0 OPERAND
A7-0 OPERAND
Address<15:0>
Address A15-8
Address A15-8
Address A15-8
Address A15-8
Figure 9-4: Four Cycles Instruction Timing
CPU CLK
Instruction Fetch Operand Fetch
Operand Fetch
Operand Fetch
Operand Fetch
C1 C2 C3 C4 C1 C2 C3 C4 C1 C2 C3 C4 C1 C2 C3 C4 C1 C2 C3 C4
ALE
PSEN
AD<7:0>
A7-0 OP-CODE
A7-0 ^OPERAND
A7-0 OPERAND
A7-0 OPERAND
A7-0 OPERAND
Address<15:0>
Address A15-8
Address A15-8
Address A15-8
Address A15-8
Address A15-8
Figure 9-5: Five Cycles Instruction Timing
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