AT32UC3B0256-Z2UR Atmel, AT32UC3B0256-Z2UR Datasheet - Page 104
AT32UC3B0256-Z2UR
Manufacturer Part Number
AT32UC3B0256-Z2UR
Description
MCU AVR32 256K FLASH 64-QFN
Manufacturer
Atmel
Series
AVR®32 UC3r
Datasheet
1.AT32UC3B164-AUR.pdf
(680 pages)
Specifications of AT32UC3B0256-Z2UR
Package / Case
64-QFN
Voltage - Supply (vcc/vdd)
1.65 V ~ 1.95 V
Operating Temperature
-40°C ~ 85°C
Speed
60MHz
Number Of I /o
44
Core Processor
AVR
Program Memory Type
FLASH
Ram Size
32K x 8
Program Memory Size
256KB (256K x 8)
Data Converters
A/D 8x10b
Oscillator Type
Internal
Peripherals
Brown-out Detect/Reset, DMA, POR, PWM, WDT
Connectivity
I²C, IrDA, SPI, SSC, UART/USART, USB
Core Size
32-Bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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13.6.6
32059J–12/2010
Keypad scan support
The External Interrupt Controller also includes support for keypad scanning. The keypad scan
feature is compatible with keypads organized as rows and columns, where a row is shorted
against a column when a key is pressed.
The rows should be connected to the external interrupt pins with pull-ups enabled in the I/O Con-
troller. These external interrupts should be enabled as low level or falling edge interrupts. The
columns should be connected to the available scan pins. The I/O Controller must be configured
to let the required scan pins be controlled by the EIC. Unused external interrupt or scan pins can
be left controlled by the I/O Controller or other peripherals.
The Keypad Scan function is enabled by writing SCAN.EN to 1, which starts the keypad scan
counter. The SCAN outputs are tri-stated, except SCAN[0], which is driven to zero. After
2
the other outputs are tri-stated. This sequence repeats infinitely, wrapping from the most signifi-
cant SCAN pin to SCAN[0].
When a key is pressed, the pulled-up row is driven to zero by the column, and an external inter-
rupt triggers. The scanning stops, and the software can then identify the key pressed by the
interrupt status register and the SCAN.PINS value.
The scanning stops whenever there is an active interrupt request from the EIC to the CPU.
When the CPU clears the interrupt flags, scanning resumes.
(SCAN.PRESC+1)
RC clock cycles this pattern is left shifted, so that SCAN[1] is driven to zero while
AT32UC3B
104
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