AT32UC3L-EK Atmel, AT32UC3L-EK Datasheet - Page 508

• Manufacturer Part Number: AT32UC3L-EK
• Description: KIT EVAL AVR32 UC3 MCU
• Manufacturer: Atmel
• Type: MCUr

Specifications of AT32UC3L-EK

• Contents: *
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Core Sub-architecture: UC3L
• Kit Contents: Board
• Features: USB / Battery Powered, Board Controller / Bootloader
• Svhc: No SVHC (15-Dec-2010)
• Rohs Compliant: Yes
• Tool Type: Starter Kit
• Cpu Core: AVR 8
• Data Bus Width: 8 bit
• Processor Series: AT32
• Processor To Be Evaluated: AT32UC3L064
• Interface Type: USB, Capacitive Touch
• For Use With/related Products: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 22-8. Slave Transmitter with Multiple Data Bytes
22.8.4
32099F–11/2010
TCOMP
TXRDY
TWD
Slave Receiver Mode
Write THR (Data n)
NBYTES set to m
S
DADR
The TWI transfers require the receiver to acknowledge each received data byte. During the
acknowledge clock pulse (9th pulse), the slave releases the data line (HIGH), enabling the
master to pull it down in order to generate the acknowledge. The slave polls the data line dur-
ing this clock pulse and sets the NAK bit in the Status Register if the master does not
acknowledge the data byte. A NAK means that the master does not wish to receive additional
data bytes. As with the other status bits, an interrupt can be generated if enabled in the Inter-
rupt Enable Register (IER).
TXRDY is used as Transmit Ready for the Peripheral DMA Controller transmit channel.
The end of the complete transfer is marked by the SR.TCOMP bit set to one. See
on page 508
Figure 22-7. Slave Transmitter with One Data Byte
If TWIS matches an address in which the R/W bit in the TWI address phase transfer is
cleared, it will enter slave receiver mode and clear SR.TRA.
After the address phase, the following is repeated:
6. If STOP is received, SR.TCOMP and SR.STO will be set.
7. If REPEATED START is received, SR.REP will be set.
zero, and the SR.BTF bit is changed to one. The ACK indicates that more data should
be transmitted, so jump to step 2.
R
TCOMP
TXRDY
TWD
A
and
Write THR (DATA)
NBYTES set to 1
Write THR (Data n+1)
Figure 22-8 on page
S
DATA n
DADR
A
R
508.
Write THR (Data n+m)
A
DATA n+5
Last data sent
DATA
AT32UC3L016/32/64
A
DATA n+m
N
STOP sent by master
P
STOP sent by master
N
P
Figure 22-7
508