NEC UPD703116 User Manual page 593

(27) CAN1 bus diagnostic information register (C1DINF)
The C1DINF register indicates all CAN bus bits, including stuff bits, delimiters, etc. This information is used
only for diagnostic purposes.
Because the number of bits starting from SOF is added at each frame, the actual number of bits is the value
obtained by subtracting the previous data.
This register is read-only, in 16-bit units.
Cautions 1. While in diagnostic processing mode (C1DEF register's MOM bit = 1) and in normal
operation mode (C1CTRL register's INIT bit = 0), the C1DINF register can only be
accessed.
cannot be accessed.
2. Storage of the last 8 bits is automatically stopped if an error or a valid message (ACK
delimiter) is detected on the CAN bus. Reset is automatically performed each time when
the SOF is detected on the CAN bus.
15 14 13 12
C1DINF DINF15 DINF14 DINF13 DINF12
Bit position Bit name
15 to 0 DINF15 to
DINF0
Note xxxx: CAN message buffer registers can be allocated to the xxxx addresses as programmable
peripheral I/O registers. Note, however, that the xxxx addresses cannot be changed after being
set.
m = 2, 6, A, E
CHAPTER 11 FCAN CONTROLLER
In normal operation mode (C1DEF register's MOM bit = 0), this register
11 10 9 8 7 6
DINF11 DINF10 DINF9 DINF8 DINF7 DINF6
Indicates CAN bus diagnostic information.
Bit name
DINF15 to DINF8 Number of bits starting from SOF
DINF7 to DINF0 Information from last 8 bits
User's Manual U14492EJ5V0UD
5 4 3 2 1 0
DINF5 DINF4 DINF3 DINF2 DINF1 DINF0
Function
CAN Bus Diagnostic Information
Address Initial value
Note
xxxxmC5CH 0000H
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