TMP88CS38FG datasheet(98/226 Pages) TOSHIBA

98 / 226 page

TMP88CS38/CM38A/CP38A

2007-09-12

88CS38-98

(3) 1-word data transfer

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

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

a. When the MST is “1” (Master mode)

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

1. When the TRX is “1” (Transmitter mode)

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

the process to generate a stop condition (Described later) and terminate data

transfer.

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

transmitted data is other than 8 bits, set the BC, set the ACK to “1”, and write the

transmitted data to the SBIDBR. After writing the data, the PIN becomes “1”, a

serial clock pulse is generated for transferring a next 1 word of data from the SCL

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

INTSBI interrupt request occurs. The PIN become “0” and the SCL pin is set to

low level. If the data to be transferred is more than one word in length, repeat the

procedure from the LRB test above.

Figure 2.9.14 Example of when BC

= “000”, ACK = “1”

2. When the TRX is “0” (Receiver mode)

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

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

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

PIN becomes “1”. A serial bus interface circuit outputs a serial clock pulse to the

SCL to transfer next 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”. Then a serial bus

interface circuit 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 2.9.15 Example of when BC

= “000”, ACK = “1”

SCL pin

SDA pin

Acknowledge

signal from a

receiver

567

INTSBI interrupt

request

Write to SBIDBR

SCL pin

SDA pin

Acknowledge

signal to a

transmitter

345

678

INTSBI interrupt

Read to SBIDBR

New D7

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