SAM4L_14 Datasheet, PDF (145/176 Pages) ATMEL Corporation – Technology for Ultra-low Power Consumption

ATSAM4L8/L4/L2
Table 9-61.
Symbol
USPI6
USART3 in SPI mode Timing, Slave Mode⁽¹⁾
Parameter
SPCK falling to MISO delay
Conditions
USPI7
MOSI setup time before SPCK rises
USPI8
USPI9
USPI10
USPI11
USPI12
USPI13
USPI14
USPI15
MOSI hold time after SPCK rises
SPCK rising to MISO delay
MOSI setup time before SPCK falls
MOSI hold time after SPCK falls
NSS setup time before SPCK rises
NSS hold time after SPCK falls
NSS setup time before SPCK falls
NSS hold time after SPCK rises
V_VDDIO from
3.0V to 3.6V,
maximum
external
capacitor =
40 pF
Min
45.93 + t_SAMPLE(2) +
t_{CLK_USART}
47.03 -( t_SAMPLE(2) +
t_{CLK_USART )}
45.93 +( t_SAMPLE(2) +
t_{CLK_USART )}
47.03 -( t_SAMPLE(2) +
t_{CLK_USART )}
237.5
-1.81
237.5
-1.81
Notes:
1. These values are based on simulation. These values are not covered by test limits in production.
2.
Where:
t_SAMPLE
=
t_S
PCK
–
⎛
⎝
------------^t--^S--^P----^C---^K-------------
2 × t_CLKUSART
+ ¹²--_⎠⎞ × t_CLKUSART
Max
593.9
593.38
Units
ns
Maximum SPI Frequency, Slave Input Mode
The maximum SPI slave input frequency is given by the following formula:
f_SPCKMAX
=
M I N (^f--^C----^L---^K----^S--^P----^I---^×-----²- ,-----¹-------)
9 SPIn
Where SPIn is the MOSI setup and hold time, USPI7 + USPI8 or USPI10 + USPI11 depending
on CPOL and NCPHA. f_CLKSPI is the maximum frequency of the CLK_SPI. Refer to the SPI
chapter for a description of this clock.
Maximum SPI Frequency, Slave Output Mode
The maximum SPI slave output frequency is given by the following formula:
f_SPCKMAX = MIN(^f--^C----^L---^K----^S₉--^P----^I---^×-----²-, f_PINMAX,-_S---_P----_I--_n-----+--¹---_t--_S--_E----_T---_U----_P-)
Where SPIn is the MISO delay, USPI6 or USPI9 depending on CPOL and NCPHA. T_SETUP is
the SPI master setup time. refer to the SPI master datasheet for T_SETUP . f_CLKSPI is the maxi-
mum frequency of the CLK_SPI. Refer to the SPI chapter for a description of this clock.f_PINMAX
is the maximum frequency of the SPI pins. refer to the I/O Pin Characteristics section for the
maximum frequency of the pins.
42023GS–SAM–03/2014
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