TMP93CS44 datasheet(166/224 Pages) TOSHIBA

166 / 224 page

TMP93CS44/S45

2004-02-10

93CS44-164

(5) Restart

Restart is used to change the direction of data transfer between a master device and

a slave device during transferring data. The following explains how to restart the

TMP93CS44/S45.

Clear 0 to the <MST>, <TRX>, and <BB> and set 1 to the <PIN>. The SDA pin

retains the high level and the SCL pin is released. Since a stop condition is not

generated on the bus, the bus is assumed to be in a busy state from other devices. And

confirm SCL pin, that SCL pin is released and become bus-free state by SBISR<BB>

“0” or signal level “1” of SCL pin in port mode. Test the <LRB> until it becomes 1 to

check that the SCL line of the bus is not set to low level by other devices. After

confirming that the bus stays in a free state, generate a start condition with procedure

(2).

In order to meet setup time when restarting, take at least 4.7

µs of waiting time by

software from the time of restarting to confirm that the bus is free until the time to

generate the start condition.

Figure 3.10.17 Timing Diagram when Restarting the TMP93CS44/S45

<LRB>

SCL (Bus)

SCL pin

SDA pin

<PIN>

4.7

µs (Min)

<BB>

Start condition

“0”

→ <MST>

“0”

→ <TRX>

“0”

→ <BB>

“1”

→ <PIN>

“1”

→ <MST>

“1”

→ <TRX>

“1”

→ <BB>

“1”

→ <PIN>

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