Maxim-integrated Ultra-High-Speed Flash Microcontroller Manuale Utente Scaricare il pdf (Pagina 118)

10-5

XTAL1

ALE

PORT 0

PORT 2

PSEN

C1 C2 C3 C4 C1 C2 C1 C2

EXT CODE FETCHES

PAGE MISS

INTERNAL MEMORY CYCLES

PAGE HIT PAGE HIT

MSB ADD

LSB ADD LSB ADD LSB ADD

DATA DATA DATA

Figure 10-5. External Program Memory Access (Page Mode 2)

ALE

PSEN

Port 0

Port 2

ALE

PSEN

Port 0

Port 2

RD / WR

XTAL1

InstInst Inst InstInst

MSBLSB LSB LSBLSB

LSB LSB LSB

Inst

Data

Memory Access (Stretch = 4)

MOVX Instruction (Page miss)

1st

Cycle

2nd

Cycle

3rd

Cycle

4th

Cycle

9th

Cycle

MOVX

Instruction

Fetch

LSB LSB LSB

Inst Inst Inst

MOVX Instruction (Page hit)

Memory Access (Stretch = 4)

MOVX

Instruction

Fetch

1st

Cycle

2nd

Cycle

3rd

Cycle

4th

Cycle

5th

Cycle

9th

Cycle

LSBLSBLSBLSB

Inst Inst Inst Inst

RD / WR

Data

LSB

Figure 10-4. External Program Memory Access (Page Mode 1)

Ultra-High-Speed Flash

Microcontroller User’s Guide

Maxim Integrated

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