Interrupts Of Can Controller - Fujitsu MB90895 Series Hardware Manual

16.4

Interrupts of CAN Controller

The CAN controller has a transmit complete interrupt, receive complete interrupt and
node state transition interrupt, and can generate interrupts when;
• The transmission complete bit (TCR: TCx) is set.
• The reception complete bit (RCR: RCx) is set.
• The node status transition flag (CSR: NT) is set.
I Interrupts of CAN Controller
Table 16.4-1 shows the interrupt control bits and interrupt factors of the CAN controller.
Table 16.4-1 Interrupt Control Bits and Interrupt Factors of CAN Controller
Transmission/ Interrupt flag bit
Reception
Transmission Transmission
complete bit TCR:
TCx=1
Reception Reception
complete bitRCR:
RCx=1
Transmission
Node status
transition flag bit
CSR: NT=1
G
Transmission complete interrupt
When message transmission is completed, 1 is set to the TCx bit in the transmission complete register
(TCR).When a transmission complete interrupt is enabled (TIER: TIEx = 1) and when TCx = 1, a
transmission complete interrupt is generated.When a transmission request to the message buffer is set
(TREQR: TREQx = 1), the TCx bit in the transmission complete register (TCR) is automatically cleared to
"0".When "0" is written to the TCx bit in the transmission complete register (TCR) after the completion of
message transmitting (TCR: TCx = 1), the TCx bit is cleared.
G
Reception complete interrupt
When message reception is completed, "1" is set to the RCx bit in the receive complete register
(RCR).When a reception complete interrupt is enabled (RIER: RIEx = 1) and when RCx = 1, a reception
complete interrupt is generated.When "0" is written to the RCx bit in the reception complete register (RCR)
after the completion of message receiving (RCR: RCx = 1), the RCx bit is cleared.
Interrupt Interrupt enable bit
factor
Message Transmission complete
transmitting interrupt enable bit
complete TIER: TIEx=1
Message Reception complete
receiving interrupt enable bit
complete RIER: RIEx=1
Node status Node status transition
transition interrupt enable bit
CSR: NIE=1
CHAPTER 16 CAN controller
Clear of the interrupt-request flag
Transmission request bit
Set TREQR: TREQx=1
Writing 0 to transmission complete bit (TCR:
TCx)
Writing 0 to reception complete bit (RCR: RCx)
Writing 0 to node status transition flag (CSR: NT)
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