UPSD3253BV 데이터 시트보기 (PDF) - STMicroelectronics

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UPSD3253BV

Flash Programmable System Devices with 8032 Microcontroller Core

STMicroelectronics 

UPSD3254A, UPSD3254BV, UPSD3253B, UPSD3253BV

Figure 14. State Sequence in uPSD325X Devices

Osc.

(XTAL2)

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

Read opcode

Read next

opcode and

discard

Read next

opcode

S1 S2 S3 S4 S5 S6

a. 1-Byte, 1-Cycle Instruction, e.g. INC A

Read opcode

Read 2nd

Byte

Read next

opcode

S1 S2 S3 S4 S5 S6

b. 2-Byte, 1-Cycle Instruction, e.g. ADD A, adrs

Read opcode

Read next

opcode and

discard

S1 S2 S3 S4 S5 S6

c. 1-Byte, 2-Cycle Instruction, e.g. INC DPTR

Read opcode

(MOVX)

Read next

opcode and

discard

S1 S2 S3 S4

d. 1-Byte, 2-Cycle MOVX Instruction

S5 S6

Addr

Read next

opcode and

discard

S1 S2 S3

No Fetch

No ALE

S1 S2 S3

Data

Read next

opcode and

discard

S4 S5 S6

No Fetch

S4 S5 S6

Access External Memory

Read next

opcode

Read next

opcode

AI06822

31/175

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