
External Bus Interface
C501
Semiconductor Group 4-2
Figure 4-1
External Program Memory Execution
PCL
OUT
PCH
OUT
One Machine Cycle One Machine Cycle
IN
INST.
IN OUT
PCL PCL
OUTIN IN OUT
PCL
IN
(A)
without
MOVX
PCL OUT
valid
PCL OUT
valid
PCL OUT
valid
PCL OUT
valid
ALE
PSEN
RD
P2
a)
b)
P2
RD
PSEN
ALE
valid
PCL OUT
valid
DPL or Ri
valid
PCL OUT
MOVX
with
(B)
IN
PCL
OUT
IN
DATA
ININ
DPH OUT OR
P2 OUT
One Machine CycleOne Machine Cycle
OUT
PCL
S6S5S4S3S2S1S6S5S4S3S2S1
MCT03220
S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6
OUT
PCH PCH
OUTOUT
PCH
PCH
OUT
OUT
PCH
INST. INST. INST. INST.
P0
P0
INST. INST. INST.
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