C868_02 Datasheet, PDF (23/244 Pages) Infineon Technologies AG – 8 - Bit CMOS Microcontroller

C868
Fundamental Structure
S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 _S6
P1 P2 P1 P2 P1 P2 P1 P2 P1 P2 P1 P2 P1 P2 P1 P2 P1 P2 P1 P2 P1 P2 P1 P2
f_SYS
ALE
Read
Opcode
Read Next
Opcode (Discard)
Read Next
Opcode Again
S1 S2 S3 S4 S5 S6
(a) 1-Byte, 1-Cycle Instruction, e.g. INC A
Read
Opcode
Read 2nd
Byte
S1 S2 S3 S4 S5 S6
Read Next
Opcode
(b) 2 Byte, 1-Cycle Instruction, e.g. ADD A #Data
Read
Opcode
Read Next Opcode Again
Read Next Opcode (Discard)
S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6
(c) 1-Byte, 2-Cycle Instruction, e.g. INC DPTR
Read
Opcode
(MOVX)
Read Next
Opcode
(Discard)
Read Next Opcode Again
No Fetch
No ALE
No
Fetch
S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6
(d) MOVX (1-Byte, 2-Cycle)
ADDR
DATA
Access of External Memory
Figure 2-2 Fetch Execute Sequence
User’s Manual
2-7
V 0.4, 2002-01