TMP86FS49AIUG datasheet(223/296 Pages) TOSHIBA

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TMP86FS49AIUG

To make the transmitter terminate transmit, clear the ACK to “0” before reading data which is 1-

word before the last data to be received. A serial bus interface circuit does not generate a clock pulse

for the acknowledge signal by clearing ACK. In the interrupt routine of end of transmission, when

the BC is set to “001” and read the data, PIN is set to “1” and generates a clock pulse for a 1-bit data

transfer. In this case, since the master device is a receiver, the SDA line on a bus keeps the high-

level. The transmitter receives the high-level signal as an ACK signal. The receiver indicates to the

transmitter that data transfer is complete.

After 1-bit data is received and an interrupt request has occurred, generate the stop condition to ter-

minate data transfer.

Figure 16-12 Termination of Data Transfer in Master Receiver Mode

16.6.3.2 When the MST is “0” (Slave mode)

In the slave mode, a serial bus interface circuit operates either in normal slave mode or in slave mode

after losing arbitration.

In the slave mode, the conditions of generating INTSBI interrupt request are follows:

• At the end of acknowledge sugnal when the received slave address matches to the value set by the

I2CAR

• At the end of acknowledge sugnal when a “GENERAL CALL” is received

• At the end of transferring or receiving after matching of slave address or receiving of “GENERAL

CALL”

A serial bus interface circuit changes to a slave mode if arbitration is lost in the master mode. And an

INTSBI interrupt request occurs when word data transfer terminates after losing arbitration. The behavior

of INTSBI interrupt request and PIN after losing arbitration are shown in Table 16-3.

When an INTSBI interrupt request occurs, the PIN (bit 4 in the SBICRB) is reset, and the SCL pin is set

to low level. Either reading or writing from or to the SBIDBR or setting the PIN to “1” releases the SCL

pin after taking tLOW.

Table 16-3 The Behavior of INTSBI interrupt request and PIN after Losing Arbitration

When the Arbitration Lost Occurs during Trans-

mission of Slave Address as a Master

When the Arbitration Lost Occurs during Trans-

mission of Data as a Master Transmit Mode

INTSBI

interrupt

request

INTSBI interrupt request is generated at the termination of word data.

When the slave address matches the value set

by I2CAR, the PIN is cleared to "0" by generating

of INTSBI interrupt request. When the slave

address doesn't match the value set by I2CAR,

the PIN keeps "1".

PIN keeps "1" (PIN is not cleared to "0").

Acknowledge signal

sent to a transmitter

SCL pin

SDA pin

INTSBI

interrupt request

Clear ACK to "0"

before reading SBIDBR

Set BC to "001"

before reading SBIDBR

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