C505_9708 SIEMENS [Siemens Semiconductor Group], C505_9708 Datasheet - Page 21

• Manufacturer Part Number: C505_9708
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Figure 2-2
Fetch Execute Sequence
Semiconductor Group
OSC
(XTAL2)
ALE
(a) 1-Byte, 1-Cycle Instruction, e. g. INC A
(b) 2-Byte, 1-Cycle Instruction, e. g. ADD A #DATA
(c) 1-Byte, 2-Cycle Instruction, e. g. INC DPTR
(d) MOVX (1-Byte, 2-Cycle)
P1 P2 P1 P2
S1
S1
S1
S1
S1
S2
S2
S2
S2
S2
Read
Opcode
Read
Opcode
Read
Opcode
Read
Opcode
(MOVX)
P1 P2 P1 P2
S3
S3
S3
S3
S3
S4
S4
S4
S4
S4
P1 P2 P1 P2
Read Next
Opcode
(Discard)
S5
S5
S5
S5
S5
ADDR
Read Next
Opcode (Discard)
Read 2nd
Byte
Read Next Opcode (Discard)
Access of External Memory
S6
S6
S6
S6
S6
2-6
P1 P2 P1 P2
S1
S1
S1
DATA
No Fetch
No ALE
S2
S2
S2
P1 P2 P1 P2
S3
S3
S3
Read Next Opcode Again
Read Next
Opcode Again
Read Next
Opcode
Fundamental Structure
S4
S4
S4
No Fetch
Read Next
Opcode Again
P1 P2 P1 P2
S5
S5
S5
MCD03287
C505 / C505C
S6
S6
S6
1997-08-01