Data Sheet

311
ATmega48A/PA/88A/PA/168A/PA/328/P [DATASHEET]
Atmel-8271H-AVR- ATmega-Datasheet_08/2014
29.6 SPI Timing Characteristics
See Figure 29-3 and Figure 29-4 for details.
Note: 1. In SPI Programming mode the minimum SCK high/low period is:
- 2 t
CLCL
for f
CK
< 12MHz
- 3 t
CLCL
for f
CK
> 12MHz
Figure 29-3. SPI Interface Timing Requirements (Master Mode)
Table 29-18. SPI Timing Parameters
Description Mode Min. Typ Max
1 SCK period Master See Table 19-5
ns
2 SCK high/low Master 50% duty cycle
3 Rise/Fall time Master 3.6
4 Setup Master 10
5Hold Master 10
6 Out to SCK Master 0.5 • t
sck
7 SCK to out Master 10
8 SCK to out high Master 10
9SS
low to out Slave 15
10 SCK period Slave 4 • t
ck
11 SCK high/low
(1)
Slave 2 • t
ck
12 Rise/Fall time Slave 1600
13 Setup Slave 10
14 Hold Slave t
ck
15 SCK to out Slave 15
16 SCK to SS high Slave 20
17 SS high to tri-state Slave 10
18 SS
low to SCK Slave 20
MOSI
(Data Output)
SCK
(CPOL = 1)
MISO
(Data Input)
SCK
(CPOL = 0)
SS
MSB LSB
LSBMSB
...
...
61
22
345
8
7