User`s manual

Semiconductor Group 2-5
Fundamental Structure
C515
Figure 2-2
Fetch Execute Sequence
ALE
MCD03218
S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6
P1 P2 P2P1 P2P1 P2P1 P2P1 P2P1 P2P1 P2P1 P2P1 P2P1 P2P1 P2P1
OSC
(XTAL1)
S1 S2 S3 S4 S5 S6
Read
Opcode
Opcode (Discard)
Read next
a) 1-Byte,
b) 2-Byte,
S6S5S4S3S2S1
S1 S2 S3 S4 S5 S6
d) MOVX (1-Byte, 2-Cycle)
c) 1-Byte,
Read next Opcode (Discard)
S6S5S4S3S2S1 S1 S2 S3 S4 S5 S6
Read 2nd
Byte
Opcode
Read
Read
Opcode
Read next Opcode again
S6S5S4S3S2S1
Opcode
Read
(MOVX)
ADDR DATA
Access External Memory
(Discard)
Read next
Opcode
No Fetch No Fetch
No ALE
2-Cycle Instruction,
1-Cycle Instruction,
e.g. INC DPTR
e.g. ADD A,
e.g. INC A
# Data
1-Cycle Instruction,
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Opcode
Opcode again
Read next
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