AT32UC3L0256_14 Datasheet, PDF (821/852 Pages) ATMEL Corporation – Read-modify-write Instructions and Atomic Bit Manipulation

AT32UC3L0128/256
Table 32-42. SPI Timing, Slave Mode⁽¹⁾
Symbol
Parameter
SPI6
SPCK falling to MISO delay
SPI7
MOSI setup time before SPCK rises
SPI8
MOSI hold time after SPCK rises
SPI9
SPCK rising to MISO delay
SPI10
MOSI setup time before SPCK falls
SPI11
MOSI hold time after SPCK falls
SPI12
NPCS setup time before SPCK rises
SPI13
NPCS hold time after SPCK falls
SPI14
NPCS setup time before SPCK falls
SPI15
NPCS hold time after SPCK rises
Conditions
Min
0
6.0
V_VDDIO from
3.0V to 3.6V,
maximum
0
external
5.5
capacitor =
40 pF
3.4
1.1
3.3
0.7
Max
Units
29.4
29.0
ns
Note: 1. These values are based on simulation and characterization of other AVR microcontrollers manufactured in the same pro-
cess technology. These values are not covered by test limits in production.
Maximum SPI Frequency, Slave Input Mode
The maximum SPI slave input frequency is given by the following formula:
f_SPCKMAX = MIN(f_CLKSPI,_S----_P-¹---_I--_n--)
Where SPIn is the MOSI setup and hold time, SPI7 + SPI8 or SPI10 + SPI11 depending on
CPOL and NCPHA. f_CLKSPI is the maximum frequency of the CLK_SPI. Refer to the SPI chap-
ter for a description of this clock.
32.9.5
Maximum SPI Frequency, Slave Output Mode
The maximum SPI slave output frequency is given by the following formula:
f_SPCKMAX = MIN(f_PINMAX,-_S---_P----_I--_n-----+--¹---_t-_S---_E----_T---_U---_P--)
Where SPIn is the MISO delay, SPI6 or SPI9 depending on CPOL and NCPHA. t_SETUP is the
SPI master setup time. Please refer to the SPI master datasheet for t_SETUP . f_PINMAX is the max-
imum frequency of the SPI pins. Please refer to the I/O Pin Characteristics section for the
maximum frequency of the pins.
TWIM/TWIS Timing
Figure 32-43 shows the TWI-bus timing requirements and the compliance of the device with
them. Some of these requirements (t_r and t_f) are met by the device without requiring user inter-
vention. Compliance with the other requirements (t_HD-STA, t_SU-STA, t_SU-STO, t_HD-DAT, t_SU-DAT-TWI, t_LOW-
TWI^{, t}HIGH^{, and f}TWCK^{) requires user intervention through appropriate programming of the relevant}
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