upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 540

• Manufacturer Part Number: upd70f3402
• Description: 32-/16-bit Single-chip Microcontroller With Can Interface
• Manufacturer: Renesas Electronics Corporation.

16.3.3 Multi masters
As the bus priority (a node acquiring transmit functions) is determined by the identifier, any node can be
the bus master.
16.3.4 Multi cast
Although there is one transmitting node, two or more nodes can receive the same data at the same time
because the same identifier can be set to two or more nodes.
16.3.5 CAN sleep mode/CAN stop mode function
The CAN sleep mode/CAN stop mode function puts the CAN controller in waiting mode to achieve low
power consumption.
The controller is woken up from the CAN sleep mode by bus operation but it is not woken up from the
CAN stop mode by bus operation (the CAN stop mode is controlled by CPU access).
16.3.6 Error control function
(1)
540
Bit
error
Stuff
error
CRC
error
Form
error
ACK
error
Type
Error types
Comparison of the output
level and level on the bus
(except stuff bit)
Check of the receive data at
the stuff bit
Comparison of the CRC
sequence generated from
the receive data and the
received CRC sequence
Field/frame check of the
fixed format
Check of the ACK slot by
the transmitting node
Detection Method
Description of Error
Mismatch of levels
6 consecutive bits of
the same output
level
Mismatch of CRC
Detection of fixed
format violation
Detection of reces-
sive level in ACK slot
Chapter 16 FCAN Controller
User’s Manual U16702EE3V2UD00
Table 16-11: Error Types
Detection
Condition
Transmitting/
receiving node
Receiving node
Receiving node
Receiving node
Transmitting
node
Transmission/
Reception
Detection State
Bit that is outputting data on the
bus at the start of frame to end
of frame, error frame and over-
load frame.
Start of frame to CRC sequence
CRC field
CRC delimiter
ACK field
End of frame
Error frame
Overload frame
ACK slot
Field/Frame