ATEVK1105 Atmel, ATEVK1105 Datasheet - Page 224

• Manufacturer Part Number: ATEVK1105
• Description: KIT EVAL FOR AT32UC3A0
• Manufacturer: Atmel
• Series: AVR®32r
• Type: MCUr

Specifications of ATEVK1105

• Contents: Evaluation Board, Software and Documentation
• Processor To Be Evaluated: AT32UC3A0512
• Processor Series: AVR
• Data Bus Width: 32 bit
• Interface Type: USART, TWI, USB, SPI, Ethernet
• Operating Supply Voltage: 3.3 V
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Core Sub-architecture: AVR UC3
• Silicon Core Number: AT32UC3A0512
• Silicon Family Name: AVR
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT32UC3A0
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

24.10 Master Mode
24.10.1
24.10.2
Figure 24-5. Master Mode Typical Application Block Diagram
24.10.3
24.10.4
32058J-AVR32-04/11
Definition
Application Block Diagram
Programming Master Mode
Master Transmitter Mode
Rp: Pull up value as given by the I²C Standard
Host with
Interface
TWI
The Master is the device which starts a transfer, generates a clock and stops it.
The following registers have to be programmed before entering Master mode:
1. DADR (+ IADRSZ + IADR if a 10 bit device is addressed): The device address is used to
2. CKDIV + CHDIV + CLDIV: Clock Waveform.
3. SVDIS: Disable the slave mode.
4. MSEN: Enable the master mode.
After the master initiates a Start condition when writing into the Transmit Holding Register, THR,
it sends a 7-bit slave address, configured in the Master Mode register (DADR in MMR), to notify
the slave device. The bit following the slave address indicates the transfer direction, 0 in this
case (MREAD = 0 in MMR).
The TWI transfers require the slave to acknowledge each received byte. During the acknowl-
edge clock pulse (9th pulse), the master releases the data line (HIGH), enabling the slave to pull
it down in order to generate the acknowledge. The master polls the data line during this clock
pulse and sets the NACK in the status register if the slave does not acknowledge the byte. As
with the other status bits, an interrupt can be generated if enabled in the interrupt enable register
(IER). If the slave acknowledges the byte, the data written in the THR, is then shifted in the inter-
nal shifter and transferred. When an acknowledge is detected, the TXRDY bit is set until a new
write in the THR. When no more data is written into the THR, the master generates a stop condi-
tion to end the transfer. The end of the complete transfer is marked by the TXCOMP bit set to
one. See
TXRDY is used as Transmit Ready for the PDC transmit channel.
TWD
TWCK
access slave devices in read or write mode.
Serial EEPROM
Atmel TWI
Slave 1
Figure
24-6,
Figure
I²C RTC
Slave 2
24-7, and
Controller
I²C LCD
Slave 3
Figure 24-8 on page
I²C Temp.
Slave 4
Sensor
225.
Rp
Rp
AT32UC3A
VDD
224