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TMP86CS49FG 데이터시트(PDF) 223 Page - Toshiba Semiconductor

부품명 TMP86CS49FG
상세설명  8 Bit Microcontroller
PDF  252 Pages
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제조업체  TOSHIBA [Toshiba Semiconductor]
홈페이지  http://www.semicon.toshiba.co.jp/eng
Logo TOSHIBA - Toshiba Semiconductor

TMP86CS49FG 데이터시트(HTML) 223 Page - Toshiba Semiconductor

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Page 209
TMP86CS49FG
Figure 16-13 Stop Condition Generation
16.6.5 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 a serial bus interface circuit.
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 a bus, a bus is assumed to be in a busy state from
other devices. Test the BB until it becomes “0” to check that the SCL pin of a serial bus interface circuit is
released. Test the LRB until it becomes “1” to check that the SCL line on a bus is not pulled-down to the low
level by other devices. After confirming that a bus stays in a free state, generate a start condition with proce-
dure " 16.6.2 Start condition and slave address generation ".
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 a bus is free until the time to generate a start condition.
Note:When the master is in the receiver mode, it is necessary to stop the data transmission from the slave devcie
before the STOP condtion is generated. To stop the transmission, the master device make the slave device
receiving a negative acknowledge. Therefore, the LRB is "1" before generating the Restart and it can not be
confirmed that SCL line is not pulled-down by other devices. Please confirm the SCL line state by reading the
port.
Figure 16-14 Timing Diagram when Restarting
"1"
MST
"1"
TRX
"0"
BB
"1"
PIN
PIN
BB (Read)
Stop condition
SCL pin
SDA pin
SCL (Bus)
"0"
MST
"0"
TRX
"0"
BB
"1"
PIN
LRB
BB
Start condition
PIN
"1"
MST
"1"
TRX
"1"
BB
"1"
PIN
4.7
µs (Min)
SCL pin
SDA pin



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