AT32UC3A4128 Atmel Corporation, AT32UC3A4128 Datasheet - Page 400

• Manufacturer Part Number: AT32UC3A4128
• Manufacturer: Atmel Corporation

Specifications of AT32UC3A4128

• Flash (kbytes): 128 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 66 MHz
• Cpu: 32-bit AVR
• Hardware Qtouch Acquisition: No
• Usb Transceiver: 1
• Usb Speed: Hi-Speed
• Usb Interface: Device + OTG
• Spi: 6
• Twi (i2c): 2
• Uart: 4
• Sd / Emmc: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 128
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.0 to 3.6
• Operating Voltage (vcc): 3.0 to 3.6
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

20.7
20.7.1
20.7.2
32072G–11/2011
Programming Examples
8-bit LED-Chaser
Configuration of USART pins
It is assumed in this example that a subroutine "delay" exists that returns after a given time.
The example below shows how to configure a peripheral module to control I/O pins. It assumed
in this example that the USART receive pin (RXD) is connected to PC16 and that the USART
transmit pin (TXD) is connected to PC17. For both pins, the USART is peripheral B. In this
example, the state of the GPIO registers is assumed to be unknown. The two USART pins are
therefore first set to be controlled by the GPIO with output drivers disabled. The pins can then be
assured to be tri-stated while changing the Peripheral Mux Registers.
loop:
// Set R0 to GPIO base address
mov
orh
// Enable GPIO control of pin 0-8
mov
st.w
// Set initial value of port
mov
st.w
// Set up toggle value. Two pins are toggled
// in each round. The bit that is currently set,
// and the next bit to be set.
mov
orh
// Only change 8 LSB
mov
and
st.w
rol
rcall
rjmp
// Set up pointer to GPIO, PORTC
mov
orh
// Disable output drivers
R0, LO(AVR32_GPIO_ADDRESS)
R0, HI(AVR32_GPIO_ADDRESS)
R1, 0xFF
R0[AVR32_GPIO_GPERS], R1
R2, 0x01
R0[AVR32_GPIO_OVRS], R2
R2, 0x0303
R2, 0x0303
R3, 0x00FF
R3, R2
R0[AVR32_GPIO_OVRT], R3
R2
delay
loop
R0, LO(AVR32_GPIO_ADDRESS + PORTC_OFFSET)
R0, HI(AVR32_GPIO_ADDRESS + PORTC_OFFSET)
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