Datasheet

Section 15 Controller Area Network for Tiny (TinyCAN)
Rev. 4.00 Mar. 15, 2006 Page 344 of 556
REJ09B0026-0400
15.6 Interrupt Requests
The TinyCAN has the following interrupt requests. These interrupts can be masked except for a
reset processing interrupt caused by powering on. To mask them, the Mailbox interrupt mask
register (MBIMR) and interrupt mask register (IMR) are used. Since these interrupt requests are
allocated to the common vector addresses, their sources need to be identified by flags.
Table 15.4 Interrupt Requests
Interrupt Request Abbreviation Interrupt Condition
Wakeup WUPI When falling edge of HRXD is detected in LSI
standby mode
Unread message OVRI When new message is received while MBIMR
corresponding to receive message is 0 and
RXPR or RFPR is 1
Mailbox empty EMPI When TXPR is cleared to 0 by completion of
transmission or completion of transmission
cancellation
Overload frame transmission OVLI When overload frame is transmitted
Bus off BOFI When TEC ≥ 256 or 11 bits are received 128
times in bus off state
Error passive EPI When TEC ≥ 128 or REC ≥ 128
Receive overload warning ROWI When REC ≥ 96
Transmit overload warning TOWI When TEC ≥ 96
Remote frame request RFRI When remote frame is received and
corresponding MBIMR is 0
Receive message DFRI When message reception is completed and
corresponding MBIMR is 0
Reset/Halt RHI When processing is completed after software
reset request (RSTRQ) or halt mode request
(HLTRQ) is issued
When TEC or REC becomes 128 after incrementing or decrementing, note that the error passive
(EPI) flag issues an interrupt request. When REC or TEC becomes 96 after incrementing or
decrementing, note that the receive overload warning (ROWI) flag or transmit overload warning
(TOWI) flag issues an interrupt request, respectively.