AT32UC3L-EK Atmel, AT32UC3L-EK Datasheet - Page 509

• 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 22-10. Slave Receiver with Multiple Data Bytes
32099F–11/2010
TCOMP
RXR DY
TWD
S
DADR
The TWI transfers require the receiver to acknowledge each received data byte. During the
acknowledge 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 dur-
ing this clock pulse.
RXRDY is used as Receive Ready for the Peripheral DMA Controller receive channel.
Figure 22-9. Slave Receiver with One Data Byte
1. If SMBus mode and PEC is used, NBYTES must be set up with the number of bytes
2. Receive a byte. Set SR.BTF when done.
3. Update NBYTES. If CR.CUP is written to one, NBYTES is incremented, otherwise
4. After a data byte has been received, the slave transmits an ACK or NAK bit. For ordi-
5. If STOP is received, SR.TCOMP will be set.
6. If REPEATED START is received, SR.REP will be set.
W
to receive. This is necessary in order to know which of the received bytes is the PEC
byte. NBYTES can also be used to count the number of bytes received if using DMA.
NBYTES is decremented. NBYTES is usually configured to count downwards if PEC
is used.
nary data bytes, the CR.ACK field controls if an ACK or NAK should be returned. If
PEC is enabled and the last byte received was a PEC byte (indicated by NBYTES=0),
TWIS will automatically return an ACK if the PEC value was correct, otherwise a NAK
will be returned.
A
DATA n
TCOMP
RXR DY
TWD
A
Read RHR
S
DATA n
DATA (n+1)
DADR
A
DATA (n+1)
Read RHR
W
DAT A (n+m)-1
A
AT32UC3L016/32/64
DATA
DAT A (n+m)-1
A
Read RHR
DATA (n+m)
Read RHR
A
P
A
DATA (n+m)
Read RHR
P
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