ATMEGA325-16AJ ATMEL [ATMEL Corporation], ATMEGA325-16AJ Datasheet - Page 289

• Manufacturer Part Number: ATMEGA325-16AJ
• Description: 8-bit Microcontroller with In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

SPI Timing
Characteristics
2570A–AVR–09/04
Figure 129. Maximum Frequency vs. V
See Figure 130 and Figure 131 for details.
Table 124. SPI Timing Parameters
Note:
10
11
12
13
14
15
16
17
18
1
2
3
4
5
6
7
8
9
1. In SPI Programming mode the minimum SCK high/low period is:
16 MHz
8 MHz
SS high to tri-state
- 2 t
- 3 t
SCK to out high
SCK to SS high
SCK high/low
SS low to SCK
SCK high/low
Rise/Fall time
Rise/Fall time
SS low to out
Description
SCK period
Out to SCK
SCK period
SCK to out
SCK to out
CLCL
CLCL
Setup
Setup
Hold
Hold
2.7V
for f
for f
CK
CK
(1)
< 12 MHz
> 12 MHz
Safe Operating Area
Master
Master
Master
Master
Master
Master
Master
Master
Mode
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
4.5V
ATmega325/3250/645/6450
CC
(10 - 20 MHz).
20 • t
5.5V
4 • t
2 • t
Min
10
t
20
ck
ck
ck
ck
50% duty cycle
See Table 67
0.5 • t
Typ
3.6
1.6
10
10
10
10
15
15
10
sck
Max
ns
µs
ns
289