AT32UC3C2512C Automotive Atmel Corporation, AT32UC3C2512C Automotive Datasheet - Page 709
AT32UC3C2512C Automotive
Manufacturer Part Number
AT32UC3C2512C Automotive
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT90CAN128_AUTOMOTIVE.pdf
(225 pages)
2.AT32UC3C0512C_AUTOMOTIVE.pdf
(1312 pages)
3.AT32UC3C0512C_AUTOMOTIVE.pdf
(107 pages)
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Figure 27-15. A Read Transfer with 10-bit Addressing
27.8.9
27.8.9.1
9166C–AVR-08/11
S
1
SLAVE ADDRESS
1
SMBus Mode
1
1st 7 bits
Packet Error Checking
1
0
X
X
RW A1
SMBus mode is enabled and disabled by writing to the SMEN and SMDIS bits in CR. SMBus
mode operation is similar to I²C operation with the following exceptions:
Each SMBus transfer can optionally end with a CRC byte, called the PEC byte. Writing a one to
CMDR.PECEN enables automatic PEC handling in the current transfer. Transfers with and with-
out PEC can freely be intermixed in the same system, since some slaves may not support PEC.
The PEC LFSR is always updated on every bit transmitted or received, so that PEC handling on
combined transfers will be correct.
In master transmitter mode, the master calculates a PEC value and transmits it to the slave after
all data bytes have been transmitted. Upon reception of this PEC byte, the slave will compare it
to the PEC value it has computed itself. If the values match, the data was received correctly, and
the slave will return an ACK to the master. If the PEC values differ, data was corrupted, and the
slave will return a NACK value. The DNAK bit in SR reflects the state of the last received
ACK/NACK value. Some slaves may not be able to check the received PEC in time to return a
NACK if an error occurred. In this case, the slave should always return an ACK after the PEC
byte, and some other mechanism must be implemented to verify that the transmission was
received correctly.
In master receiver mode, the slave calculates a PEC value and transmits it to the master after all
data bytes have been transmitted. Upon reception of this PEC byte, the master will compare it to
the PEC value it has computed itself. If the values match, the data was received correctly. If the
PEC values differ, data was corrupted, and a one is written to SR.PECERR. In master receiver
mode, the PEC byte is always followed by a NACK transmitted by the master, since it is the last
byte in the transfer.
The PEC byte is automatically inserted in a master transmitter transmission if PEC is enabled
when NBYTES reaches zero. The PEC byte is identified in a master receiver transmission if
PEC is enabled when NBYTES reaches zero. NBYTES must therefore be written with the total
number of data bytes in the transmission, including the PEC byte.
0
1. Write CMDR with TENBIT=1, REPSAME=0, READ=0, START=1, STOP=0,
2. Write NCMDR with TENBIT=1, REPSAME=1, READ=1, START=1, STOP=1 and the
• Only 7-bit addressing can be used.
• The SMBus standard describes a set of timeout values to ensure progress and throughput on
• Transmissions can optionally include a CRC byte, called Packet Error Check (PEC).
• A dedicated bus line, SMBALERT, allows a slave to get a master’s attention.
• A set of addresses have been reserved for protocol handling, such as Alert Response
the bus. These timeout values must be written into SMBTR.
Address (ARA) and Host Header (HH) Address.
NBYTES=0 and the desired address.
desired address and NBYTES value.
SLAVE ADDRESS
2nd byte
A2
Sr
1
SLAVE ADDRESS
1
1
1st 7 bits
1
0
X
X
RW A3
1
DATA
A
AT32UC3C
DATA
A
P
709
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