ATmega32A Atmel Corporation, ATmega32A Datasheet - Page 269

• 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

26.2.1
26.3
26.4
8155C–AVR–02/11
Signature Bytes
Calibration Byte
Latching of Fuses
Table 26-4.
Notes:
The status of the Fuse bits is not affected by Chip Erase. Note that the Fuse bits are locked if
Lock bit1 (LB1) is programmed. Program the Fuse bits before programming the Lock bits.
The Fuse values are latched when the device enters programming mode and changes of the
Fuse values will have no effect until the part leaves Programming mode. This does not apply to
the EESAVE Fuse which will take effect once it is programmed. The fuses are also latched on
Power-up in Normal mode.
All Atmel microcontrollers have a three-byte signature code which identifies the device. This
code can be read in both serial and parallel mode, also when the device is locked. The three
bytes reside in a separate address space.
For the ATmega32A the signature bytes are:
The ATmega32A stores four different calibration values for the internal RC Oscillator. These
bytes resides in the signature row High Byte of the addresses 0x0000, 0x0001, 0x0002, and
0x0003 for 1, 2, 4 , and 8Mhz respectively. During Reset, the 1MHz value is automatically
loaded into the OSCCAL Register. If other frequencies are used, the calibration value has to be
loaded manually, see
Fuse Low
Byte
BODLEVEL
BODEN
SUT1
SUT0
CKSEL3
CKSEL2
CKSEL1
CKSEL0
1. $000: $1E (indicates manufactured by Atmel)
2. $001: $95 (indicates 32Kbytes Flash memory)
3. $002: $02 (indicates ATmega32A device when $001 is $95)
1. The default value of SUT1:0 results in maximum start-up time.
2. The default setting of CKSEL3:0 results in internal RC Oscillator @ 1MHz. See
details.
page 26
Fuse Low Byte
Bit No.
7
6
5
4
3
2
1
0
for details.
“OSCCAL – Oscillator Calibration Register” on page
Description
Brown-out Detector trigger level
Brown-out Detector enable
Select start-up time
Select start-up time
Select Clock source
Select Clock source
Select Clock source
Select Clock source
Default Value
1 (unprogrammed)
1 (unprogrammed, BOD disabled)
1 (unprogrammed)
0 (programmed)
0 (programmed)
0 (programmed)
0 (programmed)
1 (unprogrammed)
SeeTable 8-9 on page 30
ATmega32A
32“ for details.
(1)
(2)
(2)
(2)
(1)
(2)
Table 8-1 on
for
269