TMP88CU74F datasheet(92/132 Pages) TOSHIBA

92 / 132 page

TMP88CU74

2003-02-17

88CU74-92

(3) 1-word data transfer

Check the MST by the INTSBI interrupt process after a 1-word data transfer is

completed, and determine whether the mode is a master or slave.

When the MST is “1” (Master mode)

Check the TRX and determine whether the mode is a transmitter or receiver.

When the TRX is “1” (Transmitter mode)

Check the LRB. When the LRB is “1”, a receiver does not request data.

Implement the process to generate a stop condition and terminate data transfer.

When the LRB is “0”, the receiver requests new data. When the next

transmitted data is other than 8 bits, set the BC and write the transmitted data to

the SBIDBR after setting ACK to “1”. After writing the data, the PIN becomes “1”,

a serial clock pulse is generated for transferring a new 1-word of data from the

SCL pin, and then the 1-word data is transmitted. After the data is transmitted,

an INTSBI interrupt request occurs. The PIN becomes “0” and the SCL pin is

pulled down to the low level. If the data to be transferred is more than one word in

length, repeat the procedure from the LRB checking above.

Figure 2.10.12 Example when BC

= “000”, ACK = “1”

When the TRX is “0” (Receiver mode)

When the next transmitted data is other than 8 bits, set the BC again. Set the

ACK to “1” and read the received data from the SBIDBR (data which is read

immediately after a slave address is sent is undefined). After the data is read, the

PIN becomes “1”. The TMP88CU74 outputs a serial clock pulse to the SCL to

transfer new 1-word of data and sets the SDA pin to “0” at the acknowledge signal

timing.

An INTSBI interrupt request occurs and the PIN becomes “0”. The TMP88CU74

outputs a clock pulse for 1-word of data transfer and the acknowledge signal each

time that received data is read from the SBIDBR.

Figure 2.10.13 Example when BC

= “000”, ACK = “1”

SCL pin

SDA pin

Acknowledge signal

to a transmitter

INTSBI

interrupt request

Read SBIDBR

New D7

SCL pin

SDA pin

Acknowledge signal

from a receiver

INTSBI

interrupt request

Write to SBIDBR

2007-10-19

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