7220 datasheet(200/303 Pages) RENESAS

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APPLICATION

5.5 Example of I2C-BUS control by software (M37220M3-XXXSP/FP)

7220 Group User’s Manual

5-27

5.5.3 Single-chip color TV signal processor function

(1)

Status read

Status is read by sending the START condition, slave address “BB16.” After ACK is generated from

the M52340SP, the status data is read out. After the status data is output, any acknowledge bit is

not generated, but the STOP condition is sent by the master. Then this read operation is completed.

Fig. 5.5.2 Staus read timing

Bus operation of

master side:

SDA signal

Bus operation of

slave side:

: START condition

: STOP condition

: Acknowledge bit

: Read bit (1)

: No acknowledge bit

ACK

NACK

Data (n)

Slave address (R)

(2)

Byte write

Bytes are written by sending the START condition, slave address “BA16,” sub-address (1 byte), data

(1 byte), and the STOP condition from the master.

Fig. 5.5.3 Byte write timing

Bus operation of

master side:

SDA signal S

Slave

address (W)

Sub-address (n)

Data (n)

Bus operation of

slave side:

: START condition

: STOP condition

: Acknowledge bit

: Write bit (0)

ACK

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