ATMEGA32A-PU Atmel, ATMEGA32A-PU Datasheet - Page 20

• Manufacturer Part Number: ATMEGA32A-PU
• Description: MCU AVR 32K FLASH 16MHZ 40-PDIP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA32A-PU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Processor Series: ATMEGA32x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 2 KB
• Interface Type: 2-Wire, SPI, USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• Package: 40PDIP
• Device Core: AVR
• Family Name: ATmega
• Maximum Speed: 16 MHz
• Operating Supply Voltage: 3.3|5 V
• Data Rom Size: 1024 B
• Height: 4.83 mm
• Length: 52.58 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Width: 13.97 mm
• Controller Family/series: AVR MEGA
• No. Of I/o's: 32
• Eeprom Memory Size: 1KB
• Ram Memory Size: 2KB
• Cpu Speed: 16MHz
• Rohs Compliant: Yes
• For Use With: ATSTK524 - KIT STARTER ATMEGA32M1/MEGA32C1ATSTK600 - DEV KIT FOR AVR/AVR32ATAVRDRAGON - KIT DRAGON 32KB FLASH MEM AVRATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.5
7.6
7.6.1
8155C–AVR–02/11
I/O Memory
Register Description
EEARH and EEARL – EEPROM Address Register
EEPROM data corruption can easily be avoided by following this design recommendation:
The I/O space definition of the Atmel
page
All ATmega32A I/Os and peripherals are placed in the I/O space. The I/O locations are
accessed by the IN and OUT instructions, transferring data between the 32 general purpose
working registers and the I/O space. I/O Registers within the address range $00 - $1F are
directly bit-accessible using the SBI and CBI instructions. In these registers, the value of single
bits can be checked by using the SBIS and SBIC instructions. Refer to the Instruction Set sec-
tion for more details. When using the I/O specific commands IN and OUT, the I/O addresses $00
- $3F must be used. When addressing I/O Registers as data space using LD and ST instruc-
tions, $20 must be added to these addresses.
For compatibility with future devices, reserved bits should be written to zero if accessed.
Reserved I/O memory addresses should never be written.
Some of the Status Flags are cleared by writing a logical one to them. Note that the CBI and SBI
instructions will operate on all bits in the I/O Register, writing a one back into any flag read as
set, thus clearing the flag. The CBI and SBI instructions work with registers $00 to $1F only.
The I/O and Peripherals Control Registers are explained in later sections.
• Bits [15:10] – Reserved Bits
These bits are reserved bits in the ATmega32A and will always read as zero.
• Bits [9:0] – EEAR9:0: EEPROM Address
The EEPROM Address Registers
1024bytes EEPROM space. The EEPROM data bytes are addressed linearly between 0 and
1023. The initial value of EEAR is undefined. A proper value must be written before the
EEPROM may be accessed.
Bit
Read/Write
Initial Value
Keep the AVR RESET active (low) during periods of insufficient power supply voltage. This
can be done by enabling the internal Brown-out Detector (BOD). If the detection level of the
internal BOD does not match the needed detection level, an external low V
tion circuit can be used. If a reset occurs while a write operation is in progress, the write
operation will be completed provided that the power supply voltage is sufficient.
335.
EEAR7
R/W
15
R
X
–
7
0
EEAR6
R/W
14
R
X
–
6
0
EEAR5
R/W
–
13
R
X
–
5
0
EEARH and EEARL – specify the EEPROM address in the
®
AVR
EEAR4
R/W
®
12
R
X
–
4
0
ATmega32A is shown in
EEAR3
R/W
11
R
X
–
3
0
EEAR2
R/W
10
R
X
–
2
0
EEAR9
EEAR1
R/W
R/W
X
“Register Summary” on
9
1
0
ATmega32A
EEAR8
EEAR0
CC
R/W
R/W
X
X
8
0
Reset Protec-
EEARH
EEARL
20