ATXMEGA256A3B-MH Atmel, ATXMEGA256A3B-MH Datasheet - Page 131

• Manufacturer Part Number: ATXMEGA256A3B-MH
• Description: MCU AVR 256KB FLASH A3B 64-QFN
• Manufacturer: Atmel
• Series: AVR® XMEGAr

Specifications of ATXMEGA256A3B-MH

• Core Processor: AVR
• Core Size: 8/16-Bit
• Speed: 32MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 49
• Program Memory Size: 256KB (128K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.6 V ~ 3.6 V
• Data Converters: A/D 16x12b; D/A 2x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-MLF®, 64-QFN
• Processor Series: ATXMEGA256x
• Core: AVR8
• Data Bus Width: 8 bit, 16 bit
• Data Ram Size: 16 KB
• Interface Type: I2C, SPI, USART
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 49
• Number Of Timers: 7
• Operating Supply Voltage: 1.6 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit, 8 Channel
• On-chip Dac: 12 bit, 2 Channel
• For Use With: ATAVRONEKIT - KIT AVR/AVR32 DEBUGGER/PROGRMMRATSTK600 - DEV KIT FOR AVR/AVR32770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPI
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ATXMEGA256A3B-MU; ATXMEGA256A3B-MU

13.4
13.4.1
13.4.1.1
8077H–AVR–12/09
I/O Pin Configuration
Totem-pole
Totem-pole with Pull-down
The Pin n Configuration (PINnCTRL) register is used for additional I/O pin configuration. A pin
can be set in a totem-pole, wired-AND, or wired-OR configuration. It is also possible to enable
inverted input and output for the pin.
For totem-pole output there are four possible pull configurations: Totem-pole (Push-pull), Pull-
down, Pull-up and Bus-keeper. The bus-keeper is active in both directions. This is to avoid oscil-
lation when disabling the output. The totem-pole configurations with pull-up and pull-down only
have active resistors when the pin is set as input. This feature eliminates unnecessary power
consumption. For wired-AND and wired-OR configuration, the optional pull-up and pull-down
resistors are active in both input and output direction.
Since pull configuration is configured through the pin configuration register, all intermediate port
states during switching of pin direction and pin values are avoided.
The I/O pin configurations are summarized with simplified schematics from
131
When configured for Totem-pole (push-pull), the pin is driven low or high according to the corre-
sponding bit setting in OUT. In this configuration there is no current limitation for sink or source
other than what the pin is capable of. If the pin is configured for input, the pin will float if no exter-
nal pull is connected.
Figure 13-2. I/O pin configuration - Totem-pole (push-pull)
In this mode, the configuration is as for Totem-pole, expect the pin is configured with internal
pull-down when set as input.
Figure 13-3. I/O pin configuration - Totem-pole with pull-down (on input)
to
Figure 13-7 on page
OUTn
DIRn
133.
INn
OUTn
DIRn
INn
Pn
Figure 13-2 on page
XMEGA A
Pn
131