Rainbow-electronics DS1372 Manual do Utilizador descarregar pdf (Página 9)

conditions. The DS1372 operates as a slave on the I

bus. Connections to the bus are made through the SCL

input and open-drain SDA I/O lines. Within the bus

specifications, a standard mode (100kHz maximum

clock rate) and a fast mode (400kHz maximum clock

rate) are defined. The DS1372 works in both modes.

The following bus protocol has been defined (Figure 5):

• Data transfer can be initiated only when the bus is

not busy.

• During data transfer, the data line must remain stable

whenever the clock line is high. Changes in the data

line while the clock line is high are interpreted as

control signals.

DS1372

_______________________________________________________________________________________ 9

SDA

SCL

HD:STA

LOW

HIGH

BUF

HD:DAT

SU:DAT

REPEATED

START

SU:STA

HD:STA

SU:STO

STOP START

Figure 4. Data Transfer on I

C Serial Bus

STOP

CONDITION

OR REPEATED

START

CONDITION

REPEATED IF MORE BYTES

ARE TRANSFERED

ACK

START

CONDITION

ACK

ACKNOWLEDGEMENT

SIGNAL FROM RECEIVER

ACKNOWLEDGEMENT

SIGNAL FROM RECEIVER

SLAVE ADDRESS

MSB

SCL

SDA

R/W

DIRECTION

BIT

12 678 9 12 893–7

Figure 5. I

C Data Transfer Overview

C, 32-Bit, Binary Counter Clock with 64-Bit ID

1 2 3 4 5 6 7 8 9 10 11 12

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