
Document Number : 38-16007 Rev. *L Page 26 of 34
AC Characteristics
[16]
Notes
16. AC values are not guaranteed if voltages on any pin exceed Vcc.
17. This stretch only applies to every 9th SCK HI pulse for SPI Burst Reads only.
18. For F
OSC
= 13 MHz ±50 ppm, 3.2 V at 25°C.
19. SCK must start low, otherwise the success of SPI transactions are not guaranteed.
Table 37. SPI Interface
[18]
Parameter Description Min Typ Max Unit
t
SCK_CYC
SPI clock period 476 – – ns
t
SCK_HI (BURST READ)
[17]
SPI clock high time 238 – – ns
t
SCK_HI
SPI clock high time 158 – – ns
t
SCK_LO
SPI clock low time 158 – – ns
t
DAT_SU
SPI input data setup time 10 – – ns
t
DAT_HLD
SPI input data hold time 97
[18]
––ns
t
DAT_VAL
SPI output data valid time 77
[18]
–174
[18]
ns
t
SS_SU
SPI slave select setup time before first positive edge of SCK
[19]
250 – – ns
t
SS_HLD
SPI slave select hold time after last negative edge of SCK 80 – – ns
Figure 11. SPI Timing Diagram
Figure 12. SPI Burst Read Every 9th SCK HI Stretch Timing Diagram
data from mcu
MOSI
t
SCK_CYC
SCK
t
SCK_HI
t
SCK_LO
t
DAT_SU
t
DAT_HLD
MISO
SS
t
SS_SU
t
SS_HLD
t
DAT_VAL
data
data
S
A
M
P
L
E
D
R
I
V
E
data from mcu data from mcu
data to mcu data to mcu
data to mcu
MISO
t
SCK_CYC
SCK
t
SCK_HI
t
SCK_LO
SS
t
DAT_VAL
data
D
R
I
V
E
data to mcu data to mcu
every 8
th
SCK_HI every 9
th
SCK_HI every 10
th
SCK_HI
t
SCK_HI (BURST READ)
D
R
I
V
E
D
R
I
V
E
Not Recommended for New Designs
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