ATmega32U2 Atmel Corporation, ATmega32U2 Datasheet - Page 269

• Manufacturer Part Number: ATmega32U2
• Manufacturer: Atmel Corporation

Specifications of ATmega32U2

• Flash (kbytes): 32 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 22
• Ext Interrupts: 20
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 2
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 1
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 5
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

26.7
7799D–AVR–11/10
SPI Timing Characteristics
See
Table 26-6.
Note:
Figure 26-3. SPI Interface Timing Requirements (Master Mode)
10
12
13
14
15
16
17
18
11
1
2
3
4
5
6
7
8
9
Figure 26-3
(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
SCK to out high
SCK to SS high
- 2 t
- 3 t
MISO
MOSI
SCK high/low
SS low to SCK
Rise/Fall time
Rise/Fall time
SCK
SCK
SCK high/low
SS low to out
Description
SCK period
SCK period
Out to SCK
SCK to out
SCK to out
SS
SPI Timing Parameters
CLCL
CLCL
Setup
Setup
Hold
Hold
and
for f
for f
Figure 26-7
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
...
ATmega8U2/16U2/32U2
See
50% duty cycle
0.5 • t
Table 17-5
TBD
TBD
Typ
10
10
10
10
15
15
10
2
sck
LSB
1
LSB
2
Max
3
8
ns
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