AN1045 Просмотр технического описания (PDF) - STMicroelectronics

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AN1045

ST7 S/W IMPLEMENTATION OF I2C BUS MASTER

STMicroelectronics 

ST7 S/W IMPLEMENTATION OF I2C BUS MASTER

3 COMMUNICATION FRAMES

The communication protocol between the master and the slave is given in Figure 2. For more

details, please refer to the ST7 datasheet.

Figure 2. I2C Communication Protocol

Write data from ST7 to E2PROM

START E2PROM @ ACK SUB @ ACK DATA 1 ACK DATA 2

DATA N-1 ACK DATA N ACK STOP

Read data from E2PROM to ST7

START E2PROM @ ACK SUB @ ACK START E2PROM @

ACK DATA 1 ACK

DATA N NACK STOP

4 FLOWCHARTS

Figure 3. Communication Application Flowchart

Master transmitter

INITIATE TRANSMISSION

(START + addresses)

Master receiver

INITIATE TRANSMISSION

(START+@+START+@lsb=1)

no ACK?

yes

SEND NEXT TABLE DATA

no

ACK?

yes

END OF

yes

BUFFOUT?

no

no

ACK?

yes

WAIT FOR NEXT DATA TO RECEIVE

ACK

no

LAST VALUE

TO RECEIVE?

yes

STOP CONDITION

NON ACK

STOP CONDITION

4/16

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