TMP141
SBAS347A  MARCH 2005  REVISED JULY 2006
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5
1a: Master Write timing and slave detection of the data placed on the SWD bus by the master.
1b: To place a 0 on the bus, the slave does not drive the bus.
1c: To place a 1 on the bus, the slave holds the bus low after detecting that the master has started a data bit.
0祍
50祍
100祍
Master Write 0
Master Write 1
t
INACT
t
INACT
t
Mtr1
t
Mtr0
SlvDetectData1
Master Write Start
t
INACT
t
MtrS
DetectStart
t
INACT
t
Mtr0
SlvDetect_st
(1)
t
SFEdet
Master starts a bit
Slave detects bus activity and
does nothing, leaving the bit a 0.
Master Read 0
t
INACT
t
Mtr0
SlvDetect_st
(1)
t
SFEdet
MstDetect_1
Master starts a bit
Slave pulls Bus low to send back a 1
Master Read 1
NOTE: (1) Margin from t
SFEdet
 to t
Mtr0
 is 2.2祍.
Figure 1. TMP141 Read and Write Signal Timing
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