ATMEGA32L-8AUR Atmel, ATMEGA32L-8AUR Datasheet - Page 20
![no-image](/images/manufacturer_photos/0/0/78/atmel_sml.jpg)
ATMEGA32L-8AUR
Manufacturer Part Number
ATMEGA32L-8AUR
Description
MCU AVR 32K FLASH 8MHZ 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA32L-8AUR
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
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
*
Package
44TQFP
Device Core
AVR
Family Name
ATmega
Maximum Speed
8 MHz
Operating Supply Voltage
3.3|5 V
Data Bus Width
8 Bit
Number Of Programmable I/os
32
Interface Type
TWI/SPI/USART
On-chip Adc
8-chx10-bit
Number Of Timers
3
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
- Current page: 20 of 346
- Download datasheet (6Mb)
2503Q–AVR–02/11
• Bit 1 – EEWE: EEPROM Write Enable
The EEPROM Write Enable Signal EEWE is the write strobe to the EEPROM. When address
and data are correctly set up, the EEWE bit must be written to one to write the value into the
EEPROM. The EEMWE bit must be written to one before a logical one is written to EEWE, oth-
erwise no EEPROM write takes place. The following procedure should be followed when writing
the EEPROM (the order of steps 3 and 4 is not essential):
The EEPROM can not be programmed during a CPU write to the Flash memory. The software
must check that the Flash programming is completed before initiating a new EEPROM write.
Step 2 is only relevant if the software contains a Boot Loader allowing the CPU to program the
Flash. If the Flash is never being updated by the CPU, step 2 can be omitted. See
Support – Read-While-Write Self-Programming” on page 244
programming.
Caution: An interrupt between step 5 and step 6 will make the write cycle fail, since the
EEPROM Master Write Enable will time-out. If an interrupt routine accessing the EEPROM is
interrupting another EEPROM Access, the EEAR or EEDR reGister will be modified, causing the
interrupted EEPROM Access to fail. It is recommended to have the Global Interrupt Flag cleared
during all the steps to avoid these problems.
When the write access time has elapsed, the EEWE bit is cleared by hardware. The user soft-
ware can poll this bit and wait for a zero before writing the next byte. When EEWE has been set,
the CPU is halted for two cycles before the next instruction is executed.
• Bit 0 – EERE: EEPROM Read Enable
The EEPROM Read Enable Signal – EERE – is the read strobe to the EEPROM. When the cor-
rect address is set up in the EEAR Register, the EERE bit must be written to a logic one to
trigger the EEPROM read. The EEPROM read access takes one instruction, and the requested
data is available immediately. When the EEPROM is read, the CPU is halted for four cycles
before the next instruction is executed.
The user should poll the EEWE bit before starting the read operation. If a write operation is in
progress, it is neither possible to read the EEPROM, nor to change the EEAR Register.
The calibrated Oscillator is used to time the EEPROM accesses.
gramming time for EEPROM access from the CPU.
Table 1. EEPROM Programming Time
Note:
The following code examples show one assembly and one C function for writing to the
EEPROM. The examples assume that interrupts are controlled (for example by disabling inter-
rupts globally) so that no interrupts will occur during execution of these functions. The examples
EEPROM write (from CPU)
1. Wait until EEWE becomes zero.
2. Wait until SPMEN in SPMCR becomes zero.
3. Write new EEPROM address to EEAR (optional).
4. Write new EEPROM data to EEDR (optional).
5. Write a logical one to the EEMWE bit while writing a zero to EEWE in EECR.
6. Within four clock cycles after setting EEMWE, write a logical one to EEWE.
1. Uses 1MHz clock, independent of CKSEL Fuse setting.
Symbol
Number of Calibrated RC
Oscillator Cycles
8448
(1)
Typ Programming Time
Table 1
ATmega32(L)
for details about boot
8.5ms
lists the typical pro-
“Boot Loader
20
Related parts for ATMEGA32L-8AUR
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![ATMEGA32L](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Manufacturer:
ATMEL Corporation
Datasheet:
![ATMEGA32L-8AU](/photos/6/70/67042/313-44-tqfp_tmb.jpg)
Part Number:
Description:
IC AVR MCU 32K 8MHZ 3V 44TQFP
Manufacturer:
Atmel
Datasheet:
![ATMEGA32L-8MU](/photos/12/13/121316/313-44-qfn_tmb.jpg)
Part Number:
Description:
IC AVR MCU 32K 8MHZ 3V 44-QFN
Manufacturer:
Atmel
Datasheet:
![ATMEGA32L-8PU](/photos/6/70/67049/453-40-dip_tmb.jpg)
Part Number:
Description:
IC AVR MCU 32K 8MHZ 3V 40DIP
Manufacturer:
Atmel
Datasheet:
![ATMEGA32L-8PI](/photos/6/70/67049/453-40-dip_tmb.jpg)
Part Number:
Description:
IC AVR MCU 32K LV 8MHZ IND 40DIP
Manufacturer:
Atmel
Datasheet:
![ATMEGA32L-8AI](/photos/6/70/67042/313-44-tqfp_tmb.jpg)
Part Number:
Description:
IC AVR MCU 32K LV 8MHZ IND44TQFP
Manufacturer:
Atmel
Datasheet:
![ATMEGA32L-8MUR](/images/manufacturer_photos/0/0/78/atmel_tmb.jpg)
Part Number:
Description:
MCU AVR 32K FLASH 8MHZ 44QFN
Manufacturer:
Atmel
Datasheet:
![ATMEGA32L-8PC](/photos/6/70/67049/453-40-dip_tmb.jpg)
Part Number:
Description:
IC AVR MCU 32K LV 8MHZ COM 40DIP
Manufacturer:
Atmel
Datasheet:
![ATMEGA32L-8MC](/photos/12/13/121316/313-44-qfn_tmb.jpg)
Part Number:
Description:
IC AVR MCU 32K LV 8MHZ COM 44QFN
Manufacturer:
Atmel
Datasheet:
![ATMEGA32L-8AC](/photos/6/70/67042/313-44-tqfp_tmb.jpg)
Part Number:
Description:
IC AVR MCU 32K LV 8MHZ COM44TQFP
Manufacturer:
Atmel
Datasheet:
![ATMEGA32L-8MI](/photos/12/13/121316/313-44-qfn_tmb.jpg)
Part Number:
Description:
IC AVR MCU 32K LV 8MHZ IND 44QFN
Manufacturer:
Atmel
Datasheet:
![ATMEGA32L-8AJ](/photos/6/70/67042/313-44-tqfp_tmb.jpg)
Part Number:
Description:
IC MCU AVR 32K 5V 8MHZ 44-TQFP
Manufacturer:
Atmel
Datasheet: