TMP86FS49AIUG datasheet(224/296 Pages) TOSHIBA

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16. Serial Bus Interface(I2C Bus) Ver.-D (SBI)

16.6 Data Transfer of I2C Bus

TMP86FS49AIUG

Check the AL (Bit3 in the SBISRB), the TRX (Bit6 in the SBISRB), the AAS (Bit2 in the SBISRB),

and the AD0 (Bit1 in the SBISRB) and implements processes according to conditions listed in " Table 16-

4 Operation in the Slave Mode ".

Note: In the slave mode, if the slave address set in I2CAR is "00H", a START Byte "01H" in I2C bus standard is recived, the

device detects slave address match and the TRX is set to "1".

16.6.4 Stop condition generation

When the BB is “1”, a sequence of generating a stop condition is started by setting “1” to the MST, TRX and

PIN, and clear “0” to the BB. Do not modify the contents of the MST, TRX, BB, PIN until a stop condition is

generated on a bus.

When a SCL line on a bus is pulled-down by other devices, a serial bus interface circuit generates a stop con-

dition after they release a SCL line.

The time from the releasing SCL line until the generating the STOP condition takes tLOW.

Table 16-4 Operation in the Slave Mode

TRX

AAS

AD0

Conditions

Process

A serial bus interface circuit loses arbitra-

tion when transmitting a slave address.

And receives a slave address of which the

value of the direction bit sent from another

master is "1".

Set the number of bits in 1 word to the BC

and write transmitted data to the SBIDBR.

In the slave receiver mode, a serial bus

interface circuit receives a slave address

of which the value of the direction bit sent

from the master is "1".

In the slave transmitter mode, 1-word data

is transmitted.

Test the LRB. If the LRB is set to "1", set

the PIN to "1" since the receiver does not

request next data. Then, clear the TRX to

"0" to release the bus. If the LRB is set to

"0", set the number of bits in 1 word to the

BC and write transmitted data to the

SBIDBR since the receiver requests next

data.

11/0

A serial bus interface circuit loses arbitra-

tion when transmitting a slave address.

And receives a slave address of which the

value of the direction bit sent from another

master is "0" or receives a "GENERAL

CALL".

Read the SBIDBR for setting the PIN to

"1" (Reading dummy data) or write "1" to

the PIN.

A serial bus interface circuit loses arbitra-

tion when transmitting a slave address or

data. And terminates transferring word

data.

A serial bus interface circuit is changed to

slave mode. To clear AL to "0", read the

SBIDBR or write the data to SBIDBR.

11/0

In the slave receiver mode, a serial bus

interface circuit receives a slave address

of which the value of the direction bit sent

from the master is "0" or receives "GEN-

ERAL CALL".

Read the SBIDBR for setting the PIN to

"1" (Reading dummy data) or write "1" to

the PIN.

01/0

In the slave receiver mode, a serial bus

interface circuit terminates receiving of 1-

word data.

Set the number of bits in 1-word to the BC

and read received data from the SBIDBR.

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