UPSD33XX Datasheet, PDF (20/231 Pages) STMicroelectronics – Fast 8032 MCU with Programmable Logic

uPSD33xx
Figure 9. PFQ Operation on Multi-cycle Instructions
Three 2-byte, 2-cycle Instructions on uPSD33XX
Pre-Fetch Inst A
Pre-Fetch Inst B
Pre-Fetch Inst C
PFQ Inst A, Byte 1 Inst A, Byte 2 Inst B, Byte 1 Inst B, Byte 2 Inst C, Byte 1 Inst C, Byte 2 Continue to Pre-Fetch
4-clock
Macine Cycle
MCU
Previous Instruction
Execution
Phase 1
A1 A2
Phase 2
Process A
Phase 3
B1 B2
Phase 4
Process B
Phase 5
C1 C2
Phase 6
Process C
Next Inst
Instruction A
Instruction B
Instruction C
AI08810
Figure 10. uPSD33xx Multi-cycle Instructions Compared to Standard 8032
Three 2-byte, 2-cycle Instructions, uPSD33XX vs. Standard 8032
24 Clocks Total (4 clocks per cycle)
uPSD33XX A1 A2
Inst A B1 B2
1 Cycle
Inst B
C1 C2
Inst C
72 Clocks (12 clocks per cycle)
Std 8032
Byte 1 Byte 2 Process Inst A Byte 1 Byte 2 Process Inst B Byte 1 Byte 2 Process Inst C
1 Cycle
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