Rainbow Electronics W79E8213R - Manual (Page 51)

Preliminary W79E8213/W79E8213R Data Sheet
Publication Release Date: July 11, 2008
- 51 - Revision A2
OPERAND OPERAND OPERAND OP-CODE
Address A15-8 Address A15-8 Address A15-8 Address A15-8
A7-0 A7-0 A7-0 A7-0
Operand Fetch Operand Fetch Operand Fetch Instruction Fetch
C2 C1 C4 C3 C2 C1
CPU CLK
ALE
PSEN
AD<7:0>
Address<15:0>
C4 C3 C2 C1 C4 C3 C2 C1 C4 C3
Figure 9-4: Four Cycles Instruction Timing
OPERAND OPERAND OPERAND OP-CODE
Address A15-8 Address A15-8 Address A15-8 Address A15-8
A7-0 A7-0 A7-0 A7-0
Operand Fetch Operand Fetch Operand Fetch Operand Fetch Instruction Fetch
C2 C1 C4 C3 C2 C1
CPU CLK
ALE
PSEN
AD<7:0>
Address<15:0>
C4 C3 C2 C1 C4 C3 C2 C1 C4 C3 C2 C1 C4 C3
OPERAND A7-0
Address A15-8
Figure 9-5: Five Cycles Instruction Timing