ATxmega32D4 Atmel Corporation, ATxmega32D4 Datasheet - Page 205
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ATxmega32D4
Manufacturer Part Number
ATxmega32D4
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega32D4
Flash (kbytes)
32 Kbytes
Pin Count
44
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
34
Ext Interrupts
34
Usb Speed
No
Usb Interface
No
Spi
4
Twi (i2c)
2
Uart
2
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
12
Adc Resolution (bits)
12
Adc Speed (ksps)
200
Analog Comparators
2
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
4
Eeprom (bytes)
1024
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.6 to 3.6
Operating Voltage (vcc)
1.6 to 3.6
Fpu
No
Mpu / Mmu
no / no
Timers
4
Output Compare Channels
14
Input Capture Channels
14
Pwm Channels
14
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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18.4.1
18.4.2
18.5
18.6
18.6.1
8210B–AVR–04/10
USART Initialization
Data Transmission - The USART Transmitter
Parity Bit Calculation
SPI Frame Formats
Sending Frames
Table 1.
Even or odd parity can be selected for error checking. If even parity is selected, the parity bit is
set to one if the number of data bits that is one is odd (making the total number of ones even). If
odd parity is selected, the parity bit is set to one if the number of data bits that is one is even
(making the total number of ones odd).
The serial frame in SPI mode is defined to be one character of 8 data bits. The USART in Master
SPI mode has two valid frame formats:
When a complete frame of 8 bits is transmitted, a new frame can directly follow it, or the commu-
nication line returns to idle (high) state.
USART initialization should use the following sequence:
For interrupt driven USART operation, global interrupts should be disabled during the
initialization.
Before doing a re-initialization with changed baud rate or frame format, be sure that there are no
ongoing transmissions during the period the registers are changed. The transit and receive com-
plete interrupt flags can be used to check that the Transmitter has completed all transfers, and
that there are no unread data in the receive buffer.
When the Transmitter has been enabled, the normal port operation of the TxD pin is overridden
by the USART and given the function as the Transmitter's serial output. The direction of the pin
must be set as output using the Direction register in the corresponding port. For details on port
pin control refer to
A data transmission is initiated by loading the transmit buffer (DATA) with the data to be sent.
The data in the transmit buffer is moved to the Shift Register when the Shift Register is empty
and ready to send a new frame. The Shift Register is loaded if it is in idle state (no ongoing
St
(n)
P
Sp
IDLE
• 8-bit data with MSB first
• 8-bit data with LSB first
1. Set the TxD pin value high, and optionally the XCK pin low.
2. Set the TxD and optionally the XCK pin as output.
3. Set the baud rate and frame format.
4. Set mode of operation (enables the XCK pin output in synchronous mode).
5. Enable the Transmitter or the Receiver depending on the usage.
Start bit, always low.
Data bits (0 to 8).
Parity bit. Can be odd or even.
Stop bit, always high.
No transfers on the communication line (RxD or TxD). The IDLE state is always high.
”I/O Ports” on page
101.
XMEGA D
205