TMP89FS60 datasheet(294/410 Pages) TOSHIBA

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18. Serial Bus Interface (SBI)

18.5 Data Transfer of I2C Bus

TMP89FS60

RA001

Figure 18-18 Example when SBI0CR1<BC>="000" and SBI0CR1<ACK>="1"

(2)

When SBI0SR2<TRX> is "0" (Receiver mode)

When the data to be transmitted subsequently is other than 8 bits, set SBI0CR1<BC> again. Set

SBI0CR1< ACK> to "1" and read the received data from the SBI0DBR (Reading data is undefined

immediately after a slave address is sent).

After the data is read, SBI0CR2<PIN> becomes "1" by writing the dummy data (0x00) to the

SBI0DBR. The serial bus interface circuit outputs a serial clock pulse to the SCL0 pin to transfer the

subsequent 1-word data and sets the SDA0 pin to "0" at the acknowledge signal timing.

An interrupt request occurs and SBI0CR2<PIN> becomes "0". Then a serial bus interface circuit

outputs a clock pulse for 1-word data transfer and the acknowledge signal by writing data to the

SBI0DBR or setting SBI0CR2<PIN> to "1" after reading the received data.

Figure 18-19 Example when SBI0CR1<BC>="000" and SBI0CR1<ACK>="1"

To make the transmitter terminate transmission, execute following procedure before receiving a

last data.

1. Read the received data.

2. Clear SBI0CR1<ACK> to "0" and set SBI0CR1<BC> to "000".

3. To set SBI0CR2<PIN> to "1", write a dummy data (0x00) to SBI0DBR.

Transfer 1-word data in which no clock is generated for an acknowledge signal by setting

SBI0CR2<PIN> to "1". Next, execute following procedure.

1. Read the received data.

23456789

Acknowledge signal

from the receiver

SCL0 pin

SDA0 pin

INTSBI0 Interrupt request

SBI0CR2<PIN>

Write to SBI0DBR

Acknowledge signal

to the transmitter

23456789

New D7

Read SBI0DBR

Write to SBI0DBR

SDA0 pin

SCL0 pin

SBI0CR2<PIN>

INTSBI0 Interrupt

request

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