Spi timing characteristics, Atmega162/v – Rainbow Electronics ATmega162V User Manual
Page 267

267
ATmega162/V
2513E–AVR–09/03
SPI Timing
Characteristics
See Figure 116 and Figure 117 for details.
Note:
1. In SPI Programming mode, the minimum SCK high/low period is:
– 2 t
CLCL
for f
CK
< 12 MHz
– 3 t
CLCL
for f
CK
> 12 MHz.
Figure 116. SPI Interface Timing Requirements (Master Mode)
Table 114. SPI Timing Parameters
Description
Mode
Min
Typ
Max
1
SCK period
Master
See Table 68
ns
2
SCK high/low
Master
50% duty cycle
3
Rise/Fall time
Master
3.6
4
Setup
Master
10
5
Hold
Master
10
6
Out to SCK
Master
0.5 • t
sck
7
SCK to out
Master
10
8
SCK to out high
Master
10
9
SS low to out
Slave
15
10
SCK period
Slave
4 • t
ck
11
SCK high/low
Slave
2 • t
ck
12
Rise/Fall time
Slave
1.6
µs
13
Setup
Slave
10
ns
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
2 • t
ck
MOSI
(Data Output)
SCK
(CPOL = 1)
MISO
(Data Input)
SCK
(CPOL = 0)
SS
MSB
LSB
LSB
MSB
...
...
6
1
2
2
3
4
5
8
7
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