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EM351-RTR Datasheet(PDF) 89 Page - Silicon Laboratories

Part # EM351-RTR
Description  High-Performance, Integrated ZigBee/802.15.4 System-on-Chip
PDF  241 Pages
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

EM351-RTR Datasheet(HTML) 89 Page - Silicon Laboratories

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89
Rev 1.3
8.5.3. Constructing Frames
The TWI master controller supports generating various frame segments by means of the SC_TWISTART,
SC_TWISTOP, SC_TWISEND, and SC_TWIRECV bits in the SCx_TWICTRL1 registers. Table 8.9 summarizes
these frames.
Table 8.9. TWI Master Frame Segments
SCx_TWICTRL1
Frame Segments
SC_TWIxxxx*
START
SEND
RECV
STOP
1
0
0
0
0
1
0
0
0
0
1
0
0
0
0
1
0
0
0
0
No pending frame segment
1
—
—
1
1
1
—
—
—
1
1
—
—
—
1
1
Illegal
*Note:
The notation “xxx” means that the corresponding column header below is inserted to form the field name.
TWI re-start segment - after transmit or frame with NACK
SDAout
SDAoutSLAVE
SCLoutSLAVE
SCLout
TWI start segment
SDAout
SDAoutSLAVE
SCLoutSLAVE
SCLout
SCLout
TX[7]TX[6]
TX[5]TX[4]
TX[3]TX[2]
TX[1]TX[0]
SDAout
SDAoutSLAVE
SCLoutSLAVE
(N)ACK
TWI transmit segment - after (re-)start frame
SCLout
TX[7]TX[6]
TX[5]TX[4]
TX[3]TX[2]
TX[1]TX[0]
SDAout
SDAoutSLAVE
SCLoutSLAVE
(N)ACK
TWI transmit segment – after transmit with ACK
SCLout
RX[7]RX[6]
RX[5]RX[4]
RX[3]RX[2]
RX[1]RX[0]
SDAout
SDAoutSLAVE
SCLoutSLAVE
(N)ACK
TWI receive segment – transmit with ACK
SCLout
RX[7]RX[6]
RX[5]RX[4]
RX[3]RX[2]
RX[1]RX[0]
SDAout
SDAoutSLAVE
SCLoutSLAVE
(N)ACK
TWI receive segment - after receive with ACK
TWI stop segment - after frame with NACK or stop
SDAout
SDAoutSLAVE
SCLoutSLAVE
SCLout



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