AT32UC3L-EK Atmel, AT32UC3L-EK Datasheet - Page 474

• 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 21-7. Master Write with Multiple Data Bytes
21.8.4
32099F–11/2010
SR.IDLE
TXRDY
TWD
Master Receiver Mode
NBYTES set to n
S
Write THR
(DATAn)
DADR
TXRDY is used as Transmit Ready for the Peripheral DMA Controller transmit channel.
The end of a command is marked by setting the SR.CCOMP bit to one. See
page 474
Figure 21-6. Master Write with One Data Byte
A START condition is transmitted and master receiver mode is initiated when the bus is free
and CMDR has been written with START=1 and READ=1. START and SADR+R will then be
transmitted. During the address acknowledge clock pulse (9th pulse), the master releases the
data line (HIGH), enabling the slave to pull it down in order to acknowledge the address. The
master polls the data line during this clock pulse and sets the Address Not Acknowledged bit
(ANAK) in the Status Register if no slave acknowledges the address.
After the address phase, the following is repeated:
while (NBYTES>0)
1. Wait until RHR is empty, stretching low period of TWCK. SR.RXRDY indicates the
2. Release TWCK generating a clock that the slave uses to transmit a data byte.
3. Place the received data byte in RHR, set RXRDY.
4. If NBYTES=0, generate a NAK after the data byte, otherwise generate an ACK.
5. Decrement NBYTES
6. If (NBYTES==0) and STOP=1, transmit STOP condition.
W
state of RHR. Software or a DMA controller must read any data byte present in RHR.
SR.IDLE
TXRDY
A
and
TWD
Figure 21-7 on page
(DATAn+1)
Write THR
DATAn
Write THR (DATA)
NBYTES set to 1
S
DADR
A
474.
W
DATAn+5
Last data sent
(DATAn+m)
Write THR
A
DATA
A
AT32UC3L016/32/64
DATAn+m
(ACK received and NBYTES=0)
STOP sent automatically
A
(ACK received and NBYTES=0)
STOP sent automatically
A
P
P
Figure 21-6 on
474