atmega32u4-16mu ATMEL Corporation, atmega32u4-16mu Datasheet - Page 402

• Manufacturer Part Number: atmega32u4-16mu
• Description: Atmega32u4 8-bit Avr Microcontroller With 32k Bytes Of Isp Flash And Usb Controller
• Manufacturer: ATMEL Corporation

30.7
402
SPI Timing Characteristics
ATmega32U4
See
Table 30-3.
Note:
Figure 30-4. SPI Interface Timing Requirements (Master Mode)
10
11
12
13
14
15
16
17
18
1
2
3
4
5
6
7
8
9
Figure 30-4
(Data Output)
(Data Input)
(CPOL = 0)
(CPOL = 1)
1. In SPI Programming mode the minimum SCK high/low period is:
SS high to tri-state
- 2 t
- 3 t
SCK to out high
SCK to SS high
MISO
MOSI
SCK high/low
SS low to SCK
SCK
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
SS
SPI Timing Parameters
CLCL
CLCL
Setup
Setup
Hold
Hold
and
for f
for f
Figure 30-5
CK
CK
(1)
< 12 MHz
> 12 MHz
6
4
MSB
5
MSB
for details.
Master
Master
Master
Master
Master
Master
Master
Master
Mode
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
7
4 • t
2 • t
Min
10
20
20
t
ck
...
ck
ck
...
See
50% duty cycle
0.5 • t
Table 18-4
TBD
TBD
Typ
10
10
10
10
15
15
10
2
sck
LSB
1
LSB
2
Max
3
8
7766A–AVR–03/08
ns