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M37641F8

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

PRELIMINARY NSocothimcaene:gpTeah.riasmisetnrioct laimfiintsalasrepescuibfijceacttioton.

MITSUBISHI MICROCOMPUTERS

7641 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

φ OUT

SYNCOUT

RD

WR

Address

Data

DMAOUT

(Port P33)

Transfer request

source (“L” active)

Transfer request source

sampling

Reset of transfer request

source sampling

LDA $zz

STA $zz

DMA transfer STA $zz (last 2 cycles) Next instruction

PC

PC + 1 ADL1, 00 PC + 2

DMA

DMA desti-

source add. nation add.

PC + 3

ADL2, 00 PC + 4

A5

A DL1

Data

85

DMA

data

DMA

data

A DL2

Data Op code 3

Fig. 33 Timing chart for cycle steal transfer caused by hardware-related transfer request

φ OUT

SYNCOUT

RD

WR

Address

Data

DMAOUT

(Port P33)

Transfer request

source (“L” active)

Transfer request source

sampling

Reset of transfer request

source sampling

LDM #$90, $41

1 cycle 1 cycle 1 cycle

instruction instruction instruction DMA transfer

Next instruction

PC

PC + 1 PC + 2 42, 00

PC + 3

PC + 4

PC + 5

DMA

DMA desti-

source add. nation add.

PC + 6

3C

18

41

90

Op code 2 Op code 3 Op code 4

DMA

data

DMA

data

Op code 6

Fig. 34 Timing chart for cycle steal transfer caused by software trigger transfer request

41

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