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EXPANDED DATA MEMORY READ Figure 15–5
PSEN
MACHINE CYCLE MACHINE CYCLE
ALE
PORT 0
PORT 2 PCH/P2 PCH/P2 DPH OR P2 OUT PCH/P2
PCL
OUT
DPL OR
RI, OUT
PCL
OUT
DATA
SAMPLED
DATA
SAMPLED
DATA
SAMPLED
RD
* PCL OUT if program memory also on Expanded Bus – float if not.
**PCH OUT if program memory also on Expanded Bus.
EXPANDED DATA MEMORY WRITE Figure 15–6
PSEN
MACHINE CYCLE MACHINE CYCLE
DATA
SAMPLED
DATA
SAMPLED
ALE
PORT 0
PORT2 PCH/P2 PCH/P2 DPH OR P2 OUT PCH/P2
PCL
OUT
PCL OUT
PC
OUT
DPL OR
RI, OUT
DATA OUT
(1)
(1)
(2) (2) (2)
WR
(1) PCL OUT if program memory also on Expanded Bus – float if not.
(2) PCH OUT if program memory also on Expanded Bus.