M38048FDHKP datasheet(226/387 Pages) RENESAS

226 / 387 page

2-102

APPLICATION

2.5 Multi-master I2C-BUS interface

Rev.1.00 Jan 14, 2005

REJ09B0212-0100Z

3804 Group (Spec.H)

➁ Transmission of command

Confirm correct completion of communication at ➀ before command transmission. When receiving

the STOP condition, a process not to transmit a command is required, because the internal I2C-

BUS generates an interrupt request also owing to the STOP condition transmitted to other devices.

After confirming correct completion of communication, write a command to the I2C data shift

In case the AL bit (bit 3 of address 001316) is “1”, check the slave address comparison flag (AAS

bit; bit 2 of address 001316) to judge whether the device given a right of master transmission owing

to an arbitration specifies itself as a slave address. When it is “1”, perform the slave reception;

when “0”, wait for a STOP condition occurrence caused by other devices and the communication

completion.

In case the AL bit is “0”, check the last received bit (LRB bit; bit 0 of address 001316). When it is

“1”, make the STOP condition generate and release the bus use, because the specified slave

device does not exist on the SMBUS.

Fig. 2.5.23 Transmission process of command

AL (address 001316), bit 3 ?

AAS (address 001316), bit 2 ?

0 (ACK)

0 (not detected)

STOP condition output

S0 (address 001116)

← 000010012

PIN (address 001316), bit 4 ?

1(error)

0 (slave address transmitted)

LRB (address 001316), bit 0 ?

0 (address not corresponded)

1(NACK)

1(detected)

1 (address corresponded)

End

Re-transmission preparation

Slave reception

• Judgment of slave address comparison

• Judgment of bus hold

• Judgment of arbitration lost detection

• ACK confirmation

• Command data write to I2C data shift register

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