C508_01 Datasheet, PDF (44/267 Pages) Infineon Technologies AG – 8-Bit CMOS Microcontroller

C508
External Bus Interface
a)
ALE
One Machine Cycle
One Machine Cycle
S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6
PSEN
(A)
RD
without
MOVX
P2
PCH
OUT
PCH
OUT
PCH
OUT
PCH
PCH
OUT
OUT
P0
INST PCL
INST PCL
INST PCL
INST PCL
INST
IN OUT
IN OUT
IN OUT
IN OUT
IN
PCL OUT
valid
PCL OUT
valid
PCL OUT
valid
PCL OUT
valid
b)
One Machine Cycle
One Machine Cycle
S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6
ALE
PSEN
RD
P2
PCH
OUT
PCH
OUT
DPH OUT OR
P2 OUT
P0
INST PCL
INST
IN OUT
IN
DATA
IN
PCL OUT
valid
DPL or Ri
valid
Figure 4-1 External Program Memory Execution
(B)
with
MOVX
PCH
OUT
PCL
INST
OUT
IN
PCL OUT
valid
MCD02575
User’s Manual
4-2
2001-05