Rainbow Electronics W79E8213R - Manual (Page 50)

Preliminary W79E8213/W79E8213R Data Sheet
Publication Release Date: July 11, 2008
- 50 - Revision A2
Instruction Fetch
C4 C3 C2 C1
OP-CODE
Address A15-8 Address A15-8
ALE
PSEN
PC
AD<7:0>
Address<15:0>
CPU CLK
Operand Fetch
C4 C3 C2 C1
OPERAND PC+1
Figure 9-2: Two Cycles Instruction Timing
OPERAND OPERAND A7-0 A7-0 A7-0 OP-CODE
Address A15-8 Address A15-8 Address A15-8
Operand Fetch Operand Fetch Instruction Fetch
C2 C3 C4 C2 C3 C4 C4 C3 C2 C1 C1 C1
CPU CLK
ALE
PSEN
AD<7:0>
Address<15:0>
Figure 9-3: Three Cycles Instruction Timing