ADuC7033
Table 4. SPI Slave Mode Timing (PHASE Mode = 1)
Parameter Description
t
SS to SCLK edge
SS
tSL
SCLK low pulse width1
tSH
SCLK high pulse width1
tDAV
Data output valid after SCLK edge2
tDSU
Data input setup time before SCLK edge
tDHD
Data input hold time after SCLK edge2
tDF
Data output fall time
tDR
Data output rise time
tSR
SCLK rise time
tSF
SCLK fall time
tSFS
SS high after SCLK edge
Min
Typ
½ tSL
(SPIDIV + 1) × tHCLK
(SPIDIV + 1) × tHCLK
0
4 × tUCLK
3.5
3.5
3.5
3.5
½ tSL
1 tHCLK depends on the clock divider (CD) bits in POWCON MMR. tHCLK = tUCLK/2CD.
2 tUCLK = 48.8 ns and corresponds to the 20.48 MHz internal clock from the PLL before the clock divider.
Max
(3 × tUCLK) + (2 × tHCLK)
SS
tSS
SCLK
(POLARITY = 0)
SCLK
(POLARITY = 1)
tDOCS
MISO
tSH
tSL
tDAV
tDF
MSB
tDR
BITS [6:1]
tSFS
tSR
tSF
LSB
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
MOSI
MSB IN
BITS [6:1]
LSB IN
tDSU tDHD
Figure 4. SPI Slave Mode Timing (PHASE Mode = 1)
Rev. B | Page 12 of 140