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TRF7970A
SLOS743K – AUGUST 2011 – REVISED APRIL 2014
www.ti.com
6.10.5.1 Serial Interface Mode With Slave Select (SS)
The serial interface is in reset while the Slave Select signal is high. Serial data in (MOSI) changes on the
rising edge, and is validated in the reader on the falling edge, as shown in Figure 6-19 . Communication is
terminated when the Slave Select signal goes high.
All words must be 8 bits long with the MSB transmitted first.
WRITE
READ
Slave
tSTE,LEAD
MOSI Transitions on Data Clock
Rising Edge
MOSI Valid on Data Clock Falling Edge
Data Transition is on Data Clock
Rising Edge
MISO Valid on Data Clock Falling Edge
tSTE,LAG
Select
DATA
CLK
1/fUCxCLK
tSTE,DIS
tLO/HI
tLO/HI
tSU,SI
tHD,SI
MOSI
b7
b6…b1
b0
NO DATA TRANSITIONS
(ALL HIGH/LOW)
tSU,SO tHD,SO
tVALID,SO
MISO
DON’T CARE
b7
b6...b1
b0
Figure 6-19. SPI With Slave Select Timing Diagram
The read command is sent out on the MOSI pin, MSB first, in the first eight clock cycles. MOSI data
changes on the rising edge, and is validated in the reader on the falling edge, as shown in Figure 6-19 .
During the write cycle, the serial data out (MISO) is not valid. After the last read command bit (B0) is
validated at the eighth falling edge of SCLK, valid data can be read on the MISO pin at the falling edge of
SCLK. It takes eight clock edges to read out the full byte (MSB first). See Section 5.3 for electrical
specifications related to Figure 6-19 .
The continuous read operation is shown in Figure 6-20 .
DATA
CLK
WRITE
ADDRESS BYTE
READ DATA
BYTE 1
READ DATA
BYTE n
MOSI
B7
B6
B5
B4
B3
B2
B1
B0
No Data Transitions (All High or Low)
No Data Transitions (All High or Low)
MISO
DON’T CARE
B7
B6
B5
B4
B3
B2
B1
B0
B7
B6
B5
B4
B3
B2
B1
B0
SLAVE
SELECT
Figure 6-20. Continuous Read Operation Using SPI With Slave Select
38
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