AT32UC3B0128 Atmel Corporation, AT32UC3B0128 Datasheet - Page 204
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AT32UC3B0128
Manufacturer Part Number
AT32UC3B0128
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT32UC3A0128.pdf
(377 pages)
2.AT32UC3A0128.pdf
(33 pages)
3.AT32UC3A0128.pdf
(159 pages)
4.AT32UC3B0128.pdf
(684 pages)
5.AT32UC3B0128.pdf
(107 pages)
Specifications of AT32UC3B0128
Flash (kbytes)
128 Kbytes
Pin Count
64
Max. Operating Frequency
60 MHz
Cpu
32-bit AVR
# Of Touch Channels
32
Hardware Qtouch Acquisition
No
Max I/o Pins
44
Ext Interrupts
44
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device + OTG
Spi
4
Twi (i2c)
1
Uart
3
Ssc
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
384
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
32
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
3.0-3.6 or (1.65-1.95+3.0-3.6)
Operating Voltage (vcc)
3.0-3.6 or (1.65-1.95+3.0-3.6)
Fpu
No
Mpu / Mmu
Yes / No
Timers
10
Output Compare Channels
16
Input Capture Channels
6
Pwm Channels
13
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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18.7.4
32059L–AVR32–01/2012
SPI Slave Mode
When operating in Slave Mode, the SPI processes data bits on the clock provided on the SPI
clock pin (SPCK).
The SPI waits for NSS to go active before receiving the serial clock from an external master.
When NSS falls, the clock is validated on the serializer, which processes the number of bits
defined by the BITS field of the Chip Select Register 0 (CSR0). These bits are processed follow-
ing a phase and a polarity defined respectively by the NCPHA and CPOL bits of the CSR0. Note
that BITS, CPOL and NCPHA of the other Chip Select Registers have no effect when the SPI is
programmed in Slave Mode.
The bits are shifted out on the MISO line and sampled on the MOSI line.
When all the bits are processed, the received data is transferred in the Receive Data Register
and the RDRF bit rises. If the RDR (Receive Data Register) has not been read before new data
is received, the Overrun Error bit (OVRES) in SR is set. Data is loaded in RDR even if this flag is
set. The user has to read the status register to clear the OVRES bit.
When a transfer starts, the data shifted out is the data present in the Shift Register. If no data
has been written in the Transmit Data Register (TDR), the last data received is transferred. If no
data has been received since the last reset, all bits are transmitted low, as the Shift Register
resets at 0.
When a first data is written in TDR, it is transferred immediately in the Shift Register and the
TDRE bit rises. If new data is written, it remains in TDR until a transfer occurs, i.e. NSS falls and
there is a valid clock on the SPCK pin. When the transfer occurs, the last data written in TDR is
transferred in the Shift Register and the TDRE bit rises. This enables frequent updates of critical
variables with single transfers.
Then, a new data is loaded in the Shift Register from the Transmit Data Register. In case no
character is ready to be transmitted, i.e. no character has been written in TDR since the last load
from TDR to the Shift Register, the Shift Register is not modified and the last received character
is retransmitted.
Figure 18-9 on page 205
shows a block diagram of the SPI when operating in Slave Mode.
204
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