ATmega32A Atmel Corporation, ATmega32A Datasheet - Page 302

• Manufacturer Part Number: ATmega32A
• Manufacturer: Atmel Corporation

Specifications of ATmega32A

• Flash (kbytes): 32 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 32
• Ext Interrupts: 3
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 2
• 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: 3
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

Table 27-2.
Notes:
27.7
8155C–AVR–02/11
Symbol
t
t
SU;STO
BUF
1. In ATmega32A, this parameter is characterized and not 100% tested.
2. Required only for f
3. C
4. f
5. This requirement applies to all ATmega32A Two-wire Serial Interface operation. Other devices connected to the Two-wire
SPI Timing Characteristics
Serial Bus need only obey the general f
Parameter
Setup time for STOP condition
Bus free time between a STOP and START
condition
CK
b
= capacitance of one bus line in pF.
= CPU clock frequency
Two-wire Serial Bus Requirements (Continued)
Figure 27-5. Two-wire Serial Bus Timing
See
Table 27-3.
SCL
10
11
12
1
2
3
4
5
6
7
8
9
Figure 27-6
> 100kHz.
SCL
SDA
t
SU;STA
SCK to out high
SCK high/low
Rise/Fall time
SCK high/low
Rise/Fall time
SS low to out
SPI Timing Parameters
Description
SCK period
Out to SCK
SCK period
SCK to out
and
Setup
Hold
SCL
Figure 27-7
requirement.
t
HD;STA
t
t
of
LOW
for details.
f
f
f
f
SCL
SCL
SCL
SCL
Condition
Master
Master
Master
Master
Master
Master
Master
Master
Mode
Slave
Slave
Slave
Slave
t
HIGH
≤ 100kHz
> 100kHz
≤ 100kHz
> 100kHz
t
HD;DAT
t
LOW
4 • t
2 • t
Min
ck
ck
t
SU;DAT
See
50% duty cycle
Min
4.0
0.6
4.7
1.3
0.5 • t
Table 18-4
Typ
3.6
10
10
10
10
15
SCK
ATmega32A
t
SU;STO
t
Max
r
–
–
–
–
Max
1.6
t
BUF
Units
ns
µs
µs
µs
µs
µs
302