SH7147 Datasheet, PDF (727/1108 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 17 Controller Area Network (RCAN-ET)
Bit 4 - Receive Error Counter Warning Interrupt Flag (IRR4): This bit becomes set if the
receive error counter (REC) reaches a value greater than 95 when RCAN-ET is not in the Bus Off
status. The interrupt is reset by writing a '1' to this bit position, writing '0' has no effect.
Bit 4: IRR4
0
1
Description
[Clearing condition] Writing 1 (Initial value)
Error warning state caused by receive error
[Setting condition] When REC ≥ 96 and RCAN-ET is not in Bus Off
Bit 3 - Transmit Error Counter Warning Interrupt Flag (IRR3): This bit becomes set if the
transmit error counter (TEC) reaches a value greater than 95. The interrupt is reset by writing a '1'
to this bit position, writing '0' has no effect.
Bit 3: IRR3
0
1
Description
[Clearing condition] Writing 1 (Initial value)
Error warning state caused by transmit error
[Setting condition] When TEC ≥ 96
Bit 2 - Remote Frame Request Interrupt Flag (IRR2): flag indicating that a remote frame has
been received in a mailbox. This bit is set if at least one receive mailbox, with related MBIMR not
set, contains a remote frame transmission request. This bit is automatically cleared when all bits in
the Remote Frame Receive Pending Register (RFPR), are cleared. It is also cleared by writing a '1'
to all the correspondent bit position in MBIMR. Writing to this bit has no effect.
Bit 2: IRR2
0
1
Description
[Clearing condition] Clearing of all bits in RFPR (Initial value)
at least one remote request is pending
[Setting condition] When remote frame is received and the corresponding
MBIMR = 0
Bit 1 – Data Frame Received Interrupt Flag (IRR1): IRR1 indicates that there are pending Data
Frames received. If this bit is set at least one receive mailbox contains a pending message. This bit
is cleared when all bits in the Data Frame Receive Pending Register (RXPR) are cleared, i.e. there
is no pending message in any receiving mailbox. It is in effect a logical OR of the RXPR flags
from each configured receive mailbox with related MBIMR not set. It is also cleared by writing a
'1' to all the correspondent bit position in MBIMR. Writing to this bit has no effect.
Rev. 3.00 Oct. 06, 2008 Page 703 of 1080
REJ09B0230-0300