Datasheet

Section 15 Controller Area Network for Tiny (TinyCAN)
Rev. 4.00 Mar. 15, 2006 Page 314 of 556
REJ09B0026-0400
• TCIRR1
Bit Bit Name
Initial
Value R/W Description
7 to 5 — All 0 — Reserved
These bits are always read as 0.
4 WUPI 0 R/(W)* Wakeup Interrupt Flag
Status flag indicating detection of a dominant bit on the
CAN bus while the LSI is in standby mode. This flag can
be set to 1 only in standby mode.
[Setting condition]
When the falling edge of HRXD is detected in standby
mode
[Clearing condition]
When 1 is written to this bit
3, 2 — All 0 — Reserved
These bits are always read as 0.
1 OVRI 0 R Unread Message Interrupt Flag
Status flag indicating that a new message has been
received regardless of existence of an unread message.
The NMC bit in MCn0 (n = 0 to 3) will determine how to
handle the newly received message: NMC = 1 selects
overwrite and NMC = 0 selects overrun (ignore).
[Setting condition]
When a new message is received with the MBIMR
corresponding to the receive message cleared to 0 and
the corresponding bit in RXPR or RFPR set to 1
[Clearing condition]
When all bits in UMSR are cleared to 0
0 EMPI 0 R Mailbox Empty Interrupt Flag
Status flag indicating that the next transmit message can
be written to the Mailbox.
[Setting condition]
When TXPR is cleared to 0 by completion of transmission
or completion of transmission cancellation
[Clearing condition]
When TXACK and ABACK is cleared to 0
Note: * Only 1 can be written to clear the flag.