W79E225A_08 Datasheet, PDF (85/203 Pages) Winbond – 8-bit Microcontroller

Preliminary W79E225A/226A/227A Data Sheet
Instruction Fetch
C1
C2
C3
C4
Operand Fetch
C1
C2
C3
C4
CLK
ALE
PSEN
AD7-0
PORT 2
PC
OP-CODE
Address A15-8
PC+1
OPERAND
Address A15-8


Figure 8-2: Two Cycles Instruction Timing
Instruction Fetch
Operand Fetch
Operand Fetch
C1 C2 C3 C4 C1
C2 C3 C4 C1
C2 C3 C4
CLK
ALE
PSEN
AD7-0
PORT 2
A7-0 OP-CODE
Address A15-8
A7-0 OPERAND
Address A15-8
A7-0 OPERAND
Address A15-8


Figure 8-3: Three Cycles Instruction Timing
- 85 -
Publication Release Date: April 15, 2008
Revision A4.0