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C8051F50X_11 Datasheet, PDF (264/313 Pages) Silicon Laboratories – Mixed Signal ISP Flash MCU Family
C8051F50x/F51x
Table 25.1. SPI Slave Timing Parameters
Parameter Description
Min
Max
Units
Master Mode Timing* (See Figure 25.8 and Figure 25.9)
TMCKH
TMCKL
TMIS
SCK High Time
SCK Low Time
MISO Valid to SCK Shift Edge
1 x TSYSCLK
—
ns
1 x TSYSCLK
—
ns
1 x TSYSCLK + 20
—
ns
TMIH
SCK Shift Edge to MISO Change
0
—
ns
Slave Mode Timing* (See Figure 25.10 and Figure 25.11)
TSE
NSS Falling to First SCK Edge
2 x TSYSCLK
—
ns
TSD
Last SCK Edge to NSS Rising
2 x TSYSCLK
—
ns
TSEZ
TSDZ
NSS Falling to MISO Valid
NSS Rising to MISO High-Z
—
4 x TSYSCLK ns
—
4 x TSYSCLK ns
TCKH
TCKL
TSIS
SCK High Time
SCK Low Time
MOSI Valid to SCK Sample Edge
5 x TSYSCLK
5 x TSYSCLK
2 x TSYSCLK
—
ns
—
ns
—
ns
TSIH
TSOH
TSLH
SCK Sample Edge to MOSI Change
SCK Shift Edge to MISO Change
Last SCK Edge to MISO Change 
(CKPHA = 1 ONLY)
2 x TSYSCLK
—
6 x TSYSCLK
—
ns
4 x TSYSCLK ns
8 x TSYSCLK ns
*Note: TSYSCLK is equal to one period of the device system clock (SYSCLK).
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