Rainbow-electronics DS1904 Manuel d'utilisateur télécharger pdf (Page 5)

DS1904

5 of 12

CLOCK FUNCTION COMMAND FLOW CHART Figure 5

Master TX Control

Function Command

66H

Read Clock

?

Y

N

Bus Master

TX Reset

?

N

Y

N

Bus Master

TX Reset

?

DS1904 copies

RTC Counter

to R/W Buffer

99H

Write Clock

?

N

Y

Y

N

Bus Master

TX Reset

?

Bus Master TX

LS Byte (7:0)

Bus Master TX

next Byte (15:8)

Bus Master TX

next Byte (23:16)

Bus Master TX

MS Byte (31:24)

Bus Master TX

Device Control Byte

DS1904 copies

R/W Buffer

to RTC Counter

DS1904 TX

Presence Pulse

Bus Master RX

next Byte (15:8)

Bus Master RX

next Byte (23:16)

Bus Master RX

MS Byte (31:24)

Bus Master RX

LS Byte (7:0)

Bus Master RX

Device Control Byte

Y

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