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Texas-instruments Digital Signal Processor SM320F2812-HT Manual de usuario Pagina 113

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t
c(SPC)
+ SPI clock cycle time +
LSPCLK
4
or
LSPCLK
(SPIBRR ) 1)
+ t
c(LCO)
+ LSPCLK cycle time
(2)
SM320F2812-HT
www.ti.com
SGUS062B– JUNE 2009– REVISED JUNE 2011
Table 6-24. SPI Slave Mode External Timing (Clock Phase = 1)
(1) (2) (3)
NO. MIN MAX UNIT
12 t
c(SPC)S
Cycle time, SPICLK 8tc(LCO) ns
t
w(SPCH)S
Pulse duration, SPICLK high (clock polarity = 0) 0.5t
c(SPC)S
– 10 0.5t
c(SPC)S
13
(4)
ns
t
w(SPCL)S
Pulse duration, SPICLK low (clock polarity = 1) 0.5t
c(SPC)S
– 10 0.5t
c(SPC)S
t
w(SPCL)S
Pulse duration, SPICLK low (clock polarity = 0) 0.5t
c(SPC)S
– 10 0.5t
c(SPC)S
14
(4)
ns
t
w(SPCH)S
Pulse duration, SPICLK high (clock polarity = 1) 0.5t
c(SPC)S
– 10 0.5t
c(SPC)S
Setup time, SPISOMI before SPICLK high
t
su(SOMI-SPCH)S
0.125t
c(SPC)S
(clock polarity = 0)
17
(4)
ns
Setup time, SPISOMI before SPICLK low
t
su(SOMI-SPCL)S
0.125t
c(SPC)S
(clock polarity = 1)
Valid time, SPIS OMI data valid after SPICLK high
t
v(SPCH-SOMI)S
0.75t
c(SPC)S
(clock polarity = 0)
18
(4)
ns
Valid time, SPISOMI data valid after SPICLK low
t
v(SPCL-SOMI)S
0.75t
c(SPC)S
(clock polarity = 1)
Setup time, SPISIMO before SPICLK high
t
su(SIMO-SPCH)S
0
(clock polarity = 0)
21
(5)
ns
Setup time, SPISIMO before SPICLK low
t
su(SIMO-SPCL)S
0
(clock polarity = 1)
Valid time, SPISIMO data valid after SPICLK high
tv
(SPCH-SIMO)S
0.5t
c(SPC)S
(clock polarity = 0)
22
(5)
ns
Valid time, SPISIMO data valid after SPICLK low
t
v(SPCL-SIMO)S
0.5t
c(SPC)S
(clock polarity = 1)
(1) The MASTER/SLAVE bit (SPICTL.2) is cleared and the CLOCK PHASE bit (SPICTL.3) is set.
(3) Not production tested.
(4) The active edge of the SPICLK signal referenced is controlled by the CLOCK POLARITY bit (SPICCR.6).
(5) The active edge of the SPICLK signal referenced is controlled by the CLOCK POLARITY bit (SPICCR.6).
Copyright © 2009–2011, Texas Instruments Incorporated Electrical Specifications 113
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