W79E217A Datasheet, PDF (84/207 Pages) Winbond – 8-bit Microcontroller

Preliminary W79E217A Data Sheet
Last Cycle
of Previous
Instruction
First
Second
Third
Next Instruction
Machine Cycle Machine Cycle Machine Cycle ^{Machine Cycle}
MOVX instruction cycle
C1 C2 C3 C4 C1 C2 C3 C4 C1 C2 C3 C4 C1 C2 C3 C4 C1 C2 C3 C4
CLK
ALE
PSEN
WR
PORT 0
A0-A7
D0-D7 A0-A7
D0-D7 A0-A7
D0-D7
A0-A7
D0-D7
MOVX Inst.
Address
Next Inst.
Address
MOVX Data
Address
MOVX Inst.
Next Inst.
Read
PORT 2
A15-A8
A15-A8
MOVX Data out
A15-A8
A15-A8
Figure 8-7: Data Memory Write with Stretch Value = 1
CLK
ALE
PSEN
WR
PORT 0
Last Cycle
of Previous
Instruction
First
Machine Cycle
Second
Machine Cycle
Third
Machine Cycle
Fourth
Next
Machine Cycle ^Instruction
Machine Cycle
MOVX instruction cycle
C1 C2 C3 C4 C1 C2 C3 C4 C1 C2 C3 C4 C1 C2 C3 C4 C1 C2 C3 C4 C1 C2 C3 C4
A0-A7
D0-D7 A0-A7
D0-D7 A0-A7
D0-D7
A0-A7
D0-D7
PORT 2
MOVX Inst.
Address
Next Inst.
Address
MOVX Data
Address
MOVX Inst.
Next Inst.
Read
A15-A8
A15-A8
MOVX Data out
A15-A8
A15-A8
Figure 8-8: Data Memory Write with Stretch Value = 2
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Publication Release Date: December 14, 2007
Revision A3.0