UPSD3312D datasheet(35/272 Pages) STMICROELECTRONICS

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UPSD33xx

8032 MCU core performance enhancements

Doc ID 9685 Rev 7

35/272

Figure 8.

PFQ operation on multi-cycle instructions

Figure 9.

UPSD33xx multi-cycle instructions compared to standard 8032

Inst A, Byte 1

Three 2-byte, 2-cycle Instructions on UPSD33XX

PFQ

MCU

Execution

Inst A, Byte 2 Inst B, Byte 1 Inst B, Byte 2 Inst C, Byte 1 Inst C, Byte 2

Previous Instruction

Process A

Process B

AI08810b

Process C

Continue to Pre-Fetch

Next Inst

4-clock

Macine Cycle

Instruction A

Instruction B

Instruction C

Pre-Fetch Inst A

Pre-Fetch Inst B

Pre-Fetch Inst C

Phase 1

Phase 2

Phase 3

Phase 4

Phase 6

Phase 5

Inst A

Inst B

C1 C2

Inst C

Three 2-byte, 2-cycle Instructions, UPSD33XX vs. Standard 8032b

UPSD33XX

Std 8032

72 Clocks (12 clocks per cycle)

24 Clocks Total (4 clocks per cycle)

Byte 1

Byte 2

Process Inst A

Byte 1

Byte 2

Process Inst B

Byte 1

Byte 2

Process Inst C

AI08811b

1 Cycle

UPSD3312D Datasheet(PDF) 35 Page - STMicroelectronics

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