Instruction Manual

Preliminary W79E8213/W79E8213R Data Sheet
Publication Release Date: July 11, 2008
- 50 - Revision A2
Instruction Fetch
C4C3C2C1
OP-CODE
Address A15-8Address A15-8
ALE
PSEN
PC
AD<7:0>
A
ddress<15:0>
CPU CLK
Operand Fetch
C4C3C2
C1
OPERANDPC+1
Figure 9-2: Two Cycles Instruction Timing
OPERANDOPERAND A7-0A7-0 A7-0OP-CODE
Address A15-8Address A15-8Address A15-8
Operand FetchOperand FetchInstruction Fetch
C2 C3 C4C2 C3 C4C4C3C2 C1C1C1
CPU CLK
ALE
PSEN
AD<7:0>
A
ddress<15:0>
Figure 9-3: Three Cycles Instruction Timing